1.4.0

• Added branch-name hook to validate current branch name against a regexp at pre-push stage.
• Added type hints to hooks code.umped
• Bumped Checkstyle to 13.4.0
• Corrected trailing-whitespaces hook's syntax
• Updatd end-of-file hook docs
• Fixed checkstyle-jar cache-dir handling when --jar is used
• Declared minimum Python 3.7 and refreshed version classifiers
• Added timeout to checkstyle-jar JAR download
• Fixed trailing-whitespaces detect-only mode and error handling
• Hardened trailing-whitespaces temp-file naming against races