gb version 0.4.3

The 0.4 series focuses on improvements to project dependency management.

New features (since 0.4.2)

• gb now has the ability to automatically download released dependencies.

  Briefly summarised, if a dependency is listed in $PROJECT/depfile but is not present in the users' cache, gb will attempt to fetch it.

  NOTE: currently only dependencies hosted on github are fetched. Vanity import paths, bitbucket, private git repos, etc. are not yet supported.

  ####$PROJECT/depfile syntax

  A valid depfile lives at $PROJECT/depfile. It contains one or more lines of text. The format of the line is:

  name key=value [key=value]...

  name is an import path representing a remote repository. The only supported key is version, a valid version value is any SemVer 2.0.0 value. This version must match a release tag in the format

  v<semver version>

  For example:

  github.com/pkg/profile version=1.1.0

  Will fetch the github release tagged v1.1.0.

  Sample $PROJECT/depfile

  Elements can be separated by whitespace. Lines that do not begin with a letter or number are ignored. This provides a simple mechanism for commentary.

  # some comment
  github.com/pkg/profile version=1.1.0
  
  ; some other comment
  // third kind of comment
  lines starting with blank lines are also ignored
  github.com/pkg/errors version=0.7.0
  

  Full documentation is available on the getgb.io website. Updates #536

  Please leave feadback on this feature via the issue tracker.

• gb now depends has an external dependency on github.com/pkg/errors.