Add jorisroovers/gitlint to list of hooks

PR here: jorisroovers/gitlint#62

CC @jorisroovers

Author: asottile

all-repos.yaml

@@ -65,3 +65,4 @@
 - https://github.com/adrienverge/yamllint
 - https://github.com/thlorenz/doctoc
 - https://github.com/noahsark769/xcodeproj-sort-pre-commit-hook
+- https://github.com/jorisroovers/gitlint