Make release notes in chocolatey packages work for RCs

[petemounce]

No description provided.

[bazel-io]

Can one of the admins verify this patch?

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[petemounce]

@laszlocsomor from #2027 I just published https://chocolatey.org/packages/bazel/0.4.2-rc1-20161130-061238 that contains the release notes for RCs fix.

[laszlocsomor]

LGTM, will import