The beta released with this commit (modules-beta.6) included everything on
the release-1.3 branch up to bdf64da339
("Avoid circular package.json resolution chains.").
Unfortunately, additional commits were pushed to the branch before this
commit was pushed, so the release tag release/METEOR@1.3-modules-beta.6
does not correspond to any commit in the branch history.
Rather than attempting to rewrite the branch history, I decided to amend
this commit with this explanation before pushing it.
To see exactly what was released with the sixth beta:
git fetch --tags
git log release/METEOR@1.3-modules-beta.6
e150f6c919