Fix all markdownlint warnings, except one

CONTRIBUTING.md

@@ -8,28 +8,26 @@ particularly welcome.
 All changes are made via pull requests. In your pull request, please make sure
 that:
 
-  * The commit messages match `chezmoi`'s convention, specifically that they
-    being with a capitalized verb in the imperative and give a short
-description of what the commit does. Detailed information or justification can
-be optionally included in the body of the commit message.
+* The commit messages match `chezmoi`'s convention, specifically that they being
+  with a capitalized verb in the imperative and give a short description of what
+  the commit does. Detailed information or justification can be optionally
+  included in the body of the commit message.
 
-  * Commits are logically separate, with no merge or "fixup" commits.
+* Commits are logically separate, with no merge or "fixup" commits.
 
-  * All tests pass.
-
-  * The branch applies cleanly to `master`.
+* All tests pass.
 
+* The branch applies cleanly to `master`.
 
 ## Release management
 
 Releases are managed with [goreleaser](https://goreleaser.com/).
 
 To create a new release, push a tag, eg:
 
-    $ git tag -a v0.1.0 -m "First release"
-    $ git push origin v0.1.0
+    git tag -a v0.1.0 -m "First release"
+    git push origin v0.1.0
 
 To run a local "snapshot" build without publishing:
 
-    $ TRAVIS_BUILD_NUMBER=1 goreleaser --snapshot --rm-dist --debug --skip-publish
-
+    TRAVIS_BUILD_NUMBER=1 goreleaser --snapshot --rm-dist --debug --skip-publish