Overcommit 0.43.0

Changes

• Add GitLfs post-checkout, post-commit
  and post-merge hooks
• Display commit message when commit-msg hooks fail
• Drop support for JRuby
• Enhance pre-push hooks to expose modified_lines_in_file, similar to
  pre-commit hooks
• Add YarnCheck pre-commit hook which checks if yarn.lock matches package.json
• Add PhpUnit pre-push hook