Log Message:
Update py-gsutil to 4.68. Now Python 3 only.

Release 4.68 (release date: 2021-09-14)
=======================================
Bug Fixes
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- Improve content type inference for some common extensions.
- Copy Content-Encoding from first object in compose command.
- Support generation querying for ls command.

Other Changes
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- Add a message encouraging py3 upgrade.
- Update mock library version.
- Several documentation updates and clarifications.

Release 4.67 (release date: 2021-08-16)
=======================================
Bug Fixes
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- Update pyu2f to latest version to fix a security key reauth bug

Other Changes
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 - Several documentation updates and clarifications.

Release 4.66 (release date: 2021-07-29)
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New Features
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 - Onboard mTLS support with AIP-4114 for gsutil

Other Changes
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 - Several documentation updates and clarifications.

Release 4.65 (release date: 2021-07-02)
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New Features
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 - Add gsutil support for Public Access Prevention

Bug Fixes
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 - Fix raising-bad-type yapf errors.

Other Changes
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 - Link fix pointing to CGC docs again .
 - Backfill some small doc changes
 - Small text tweak
 - Update CHECKSUM and VERSION for 4.64 release.
 - Update CHANGES.md for 4.64 release.
 - Delete encryption addhelp page
 - Putting cl/381035251 into github
 - Backfill cl/381932961

Release 4.64 (release date: 2021-06-18)
=======================================
Bug Fixes
------------------
 - None

Other Changes
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 - Link fix pointing to CGC docs.

Release 4.63 (release date: 2021-06-09)
=======================================
Bug Fixes
------------------
 - Update warning text on KMS access denied
 - Make ** to represent zero or more folders for cloud urls
 - Raise error if final destination path ends with a delimiter.

Other Changes
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 - Fix flaky test for rm using preconditions
 - Fix pyenv issue for macOS
 - Fix rewrite tests
 - Remove unused progress callback.
 - Several documentation updates and clarifications.

Release 4.62 (release date: 2021-05-13)
=======================================
New Features
------------------
 - Add ignore-existing option for rsync .
 - Show satisifiesPZS info in bucket info listing (ls -Lb).
 - Support composite uploads with KMS.
 - Enforce custom endpoints through multipart copies and complex downloads.

Bug Fixes
------------------
 - rm will continue on object 404s.
 - Update boto submodule to include a fix for integrity checks with KMS.
 - iam ch is now case-insensitive for public members and member types.
 - Support skipping integrity checks in daisy chain transfers.
 - Ensure the correct content-length is provided for incomplete downloads.
 - Fix daisy chain for windows.
 - Fix stats crashing because of nanosecs in custom-time.
 - Delete connections after fork.
 - Patch md5 import for compliance on Red Hat FIPS mode distributions.
 - Handle case where there are too many slashes after CloudUrl scheme.
 - Allow specifying object generations in compose.
 - Raise error in setmeta if no headers are provided.
 - Fix encoding issue for rfc822 messages.
 - Fix StreamExhausted Error handling for Resumable uploads.
 - Fix wildcard ** bug.
 - Fix alignment of ls -l output.
 - Fix newlines around lists.

Other Changes
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 - Fix sonatype errors.
 - gslib: boto\_util: implement a HasUserSpecifiedGsHost() helper.
 - Adding warning to rsync if streams or named paths are included in a folder.
 - Improve parallelism warnings.
 - Several documentation updates and clarifications.

Release 4.61 (release date: 2021-04-06)
=======================================
Bug Fixes
------------------
 - Update to RSA v4.5.
 - CopyHelper accepts kms check bypass.

Other Changes
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 - Doc updates.

Release 4.60 (release date: 2021-03-11)
=======================================
Bug Fixes
------------------
 - Fixed proxy connections when using the GCS XML API.
 - Improve reliability when multiple instances of gsutil transfer to the same \ 
destination.

Other Changes
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 - Remove TravisCI and update "check for CI" references to use GitHub CI.
 - Several documentation updates and clarifications.

Release 4.59 (release date: 2021-02-10)
======================================
New Features
------------------
 - Add ignore-existing option for rsync .
 - Show satisifiesPZS info in bucket info listing (ls -Lb) .

Bug Fixes
------------------
 - Register integration test failures in kokoro script .

Other Changes
------------------
 - Use respectful code .
 - Several documentation updates and clarifications.

Release 4.58 (release date: 2021-01-21)
======================================
Bug Fixes
------------------
 - Fix more occurrences of encodestring/decodestring
 - Ignore the .github directory for updates
 - Make signurl use generation information.
 - Fix UnicodeEncodeError in Python2 for help metadata command
 - Open files in non-append mode to make stripe functionality work in Lustre \ 
file systems
 - Persist request reason header for resumable uploads and downloads.
 - improve upload speed significantly when it runs on Windows
 - Add perf-trace-token support for resumable uploads.
 - Improve error message when a bucket's name collides with another.
 - Fix formatting for empty CORS JSON document

Other Changes
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 - Several documentation updates and clarifications.
 - Add CI checks for Python 3.8

 Release 4.57 (release date: 2020-12-08)
======================================
Bug Fixes
------------------
 - Remove Unicode character from config command that was causing Python 2 issues.
 - Sync docs with web.

Release 4.56 (release date: 2020-12-03)
======================================
New Features
------------------
 - mTLS/DCA Authentication
 - Add GitHub Actions CI

Bug Fixes
------------------
 - Delete the projects.py help topic
 - Format fix for cp.py

Release 4.55 (release date: 2020-11-12)
======================================
Bug Fixes
------------------
 - Prevent trailing spaces in json output of iam get
 - Fix deprecation warnings due to invalid escape sequences.
 - Use is_alive in favour of isAlive for Python 3.9 compatibility.
 - Fix for base64.{encode/decode}string in python 3.9

Other Changes
------------------
 - Several documentation updates and clarifications.

Release 4.54 (release date: 2020-10-22)
======================================
New Features
------------------
 - Add userProject support to signurl

Bug Fixes
------------------
 - Explicitly set multiprocessing start method to 'fork'
 - Headers can now be removed
 - Fix CommandException.informational attribute error
 - Fix broken signurl error message.

Other Changes
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 - Warn when disabling parallel composite uploads for KMS encryption.
 - Handle SAML reauth challenge.
 - Several documentation updates and clarifications.