throttle gatsby-cli to every 10 rel on multiple of 10

[chenrui333]

gastby-cli release is pretty often and the changelog did not reflect what is really being changed, throttle the release on multiple of 10

commit history, https://github.com/gatsbyjs/gatsby/commits/master/packages/gatsby-cli
cli changelog, https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-cli/CHANGELOG.md

PRs in the homebrew-core history, https://github.com/Homebrew/homebrew-core/pulls?q=is%3Apr+gatsby-cli+

[MikeMcQuaid]

@chenrui333 Think you'll need to rebase on master for this.

[chenrui333]

@MikeMcQuaid I think it is good to go, thanks! :)

[MikeMcQuaid]

Thanks again @chenrui333!