Merge pull request rust-lang#2955 from ehuss/bump-version

Update to 0.5.1

Merge pull request rust-lang#2943 from ehuss/config-changelog

Add some more 0.5 Config API changes

Merge pull request rust-lang#2929 from ehuss/bump-version

Update to 0.5.0-beta.2.

Merge pull request rust-lang#2903 from ehuss/bump-version

Update to 0.5.0-beta.1

Merge pull request rust-lang#2876 from ehuss/xtask-bump

Add `cargo xtask bump`

Merge pull request rust-lang#2753 from ehuss/bump-version

Update to 0.4.52

Merge pull request rust-lang#2714 from ehuss/bump-version

Update to 0.4.51

Merge pull request rust-lang#2712 from ehuss/bump-version

Update to 0.4.50

Merge pull request rust-lang#2690 from ehuss/bump-version

Update to 0.4.49

Merge pull request rust-lang#2629 from ehuss/bump-version

Update to 0.4.48