Merge pull request Homebrew#3416 from zmwangx/bump-formula-pr-fix-mes…

…sage

bump-formula-pr: --message: add newlines before and after hr

Merge pull request Homebrew#3326 from sjackman/portable-ruby

portable-ruby: use rebuild with coverage support for Linux.

Merge pull request Homebrew#3289 from reitermarkus/cask-loader

Fix regexes in `CaskLoader`.

Merge pull request Homebrew#3211 from MikeMcQuaid/portable-ruby-coverage

portable-ruby: use rebuild with coverage support.

Merge pull request Homebrew#3182 from ilovezfs/ac_cv_xcode9

superenv: help Autotools with 10.13 SDK on 10.12

Merge pull request Homebrew#3076 from DomT4/high_sierra_b7

mac/xcode: update expected Clang on 10.13

formula_cellar_checks: remove stray backtick.

Merge pull request Homebrew#2978 from reitermarkus/simplify-dsl

Simplify `assert_only_one_stanza_allowed`.

Merge pull request Homebrew#2954 from ilovezfs/allow-install-mixed-bu…

…ild-dependency-tree

formula_installer: allow version mismatched build deps

Merge pull request Homebrew#2931 from JCount/version-devel-parsing-im…

…provements

version: improve devel spec version parsing