Log Message:
lang/npm: Update to 6.4.1.

6.4.1

BUGFIXES

- Prevent blowing up on malformed responses from the npm audit
  endpoint, such as with third-party registries.
- Fix NO_PROXY support by renaming npm-side config to --noproxy. The
  environment variable should still work.
- Disable update-notifier checks when a CI environment is detected.
- Fix issue where postpack scripts would break if pack was used with
  --dry-run.

DEPENDENCY BUMPS

- figgy-pudding@3.4.1
- cacache@11.2.0
- npm-packlist@1.1.11
- libcipm@2.0.2
- JSONStream@1.3.4
- npm-lifecycle@2.1.0
- npm-registry-client@8.6.0
- opener@1.5.0
- request@2.88.0
- tacks@1.2.7
- ci-info@1.4.0
- marked@0.5.0

DOCUMENTATION

- Mention registry terms of use in manpage and registry docs and
  update language in README for it.
- Add documentation for --dry-run in install and pack docs.
- Update republish time and lightly reorganize republish info.
- Correct npm@6.4.0 release date in changelog.
- Align command descriptions in help text.

6.4.0

NEW FEATURES

- Search for authentication token defined by environment variables by
  preventing the translation layer from env variable to npm option
  from breaking :_authToken.
- Stop filtering out non-IPv4 addresses from local-addrs, making npm
  actually use IPv6 addresses when it must.
- Configurable audit level for non-zero exit npm audit currently exits
  with exit code 1 if any vulnerabilities are found of any level. Add
  a flag of --audit-level to npm audit to allow it to pass if only
  vulnerabilities below a certain level are found. Example: npm audit
  --audit-level=high will exit with 0 if only low or moderate level
  vulns are detected.

BUGFIXES

- Don't check for updates to npm when we are updating npm itself.