v0.0.38: Fix credential parsing bug

Merge pull request #161 from google/upstream-1583445779

Fix credential parsing

v0.0.37: Fix the build + python3

At this point, it seems not worth the trouble to support python2, since I couldn't figure out how to fix the build and retain python 2 support.

Update subpar dependency

• Update subpar dependency (2018-03-07)

v0.0.35: Support cache

• Support caching downloaded image layers

Various updates

• Replace --platform in pullers with specific args
• Use custom docker client config directory
• Fix bazel dependencies

Various updates

• Save manifest and digest when downloading image
• Allow specifying platform
• Update httplib2 dependency

v0.0.32: Bugfix

• Fix bug in image digester

v0.0.31: Tool to get image digest + Bugfix

• Tool to get image digest
• Fix rules_docker #474
• Fix bug in tarball manifest LayerSource

v0.0.30: Bugfix

• Fix bug from v0.0.29 in computing diffid
• Make FromDisk work with foreign layers

v0.0.29: Foreign layers

• Add support for foreign layers, including parsing LayerSources in tarball manifests.