Releasing 0.4.14
Fixed LinkWithRelCanonicalValidator

TypeError: 'NoneType' object is not iterable
LinkWithRelCanonicalValidator: Fixed URL invalid
Releasing 0.4.15
Updating SENTRY_DSN_URL
Improving cache

Added increment_violations_count and increment_active_review_count
Releasing 0.4.16
fixing cache
Releasing 0.4.17
Fixing CircularDependencyError
Releasing 0.4.18
Locking pages
Fixing tests
Releasing 0.4.19
Fixing CircularDependencyError
Server: Fixed _insert_keys()
Using hash to create locks instead of using the actual URL
Fixing CircularDependencyError
Fixing tests
Releasing 0.4.20