v0.4.0

Fixes:

• ldc-master will use latest uploaded asset for the current platform

  Fixes rare issue when actions runs during new nightly asset upload and not all
  platforms are available for the latest commit.

New features:

• Use github access token for the api (#15)

  Oauth access token is supposed to come from a yml configuration file if
  ldc-master is used. Github actions provide one that can be used out of
  the box with secrets.GITHUB_TOKEN variable.

• Verify DMD downloads with GPG (#5)

  DMD does not use HTTPS for download links, thus using GPG signature is
  necessary to avoid MitM. LDC currently does not need/provide those.