Log Message:
duplicity: updated to 0.8.20

0.8.20

New
* Better looping.  Increase to 100 loops.
* Repeating test for LP bug 487720.
    Restore fails with "Invalid data - SHA1 hash mismatch"

Changes
* Log difftar filename where kill happened.
* Allow customization.
* Add support for --s3-multipart-chunk-size, default 25MB.
* Fix formatting in A NOTE ON GDRIVE BACKEND.  Minor.

Fix
* Fix test file count after deleting lockfile.
* Support -o{Global,User}KnownHostsFile in --ssh-options.
* Add pydrive2 to requirements.txt.
* Fix error message on gdrivebackend.
* Fix issue 57 SSH backends - IndexError: list index out of range.

Other
* Merge branch 'master' into 'master'
    Add support for new b2sdk V2 API
* Add support for new b2sdk V2 API.
* Merge branch 'master' into 'master'
    chg:dev:Fix Support DynamicLargeObjects inside swift backend
* Merge branch 'issue68' into 'master'
    have duplicity retry validate_block so object storage can report correct size
* Have duplicity retry validate\_block so object storage can report correct size.
* Merge branch 'master' into 'master'
    Replace b2sdk private API references in b2backend with public API
* Replace b2sdk private API references in b2backend with public API.
* Merge branch 'master' into 'master'
    Update b2 backend to use *public* b2sdk API.
* Update b2 backend to use *public* b2sdk API.
* Merge branch 'bullfrogalj/duplicity-master'
* B2sdk 1.8.0 refactored minimum\_part\_size to recommended\_part\_size (the \ 
value used stays the same)
    It's a breaking change that makes duplicity fail with the new SDK.
    This fix makes duplicity compatible with both pre- and post- 1.8.0 SDKs.
* Merge branch 'PR-backend-gdrive-mydrive' into 'master'
    backend gdrive, added Google MyDrive support
* Added Google MyDrive support updated man pages and --help text.