Update metadata (SonarSource#370)

Update pom version to 1.15.1

Fix quality gate: Add @nullable annotation (SonarSource#327)

Prepare bugfix release (v1.14.1)

SONARPY-333 Remove calls to SQ APIs which were deprecated in version …

…6.7 or before (SonarSource#236)

Update rule descriptions (SonarSource#223)

Update rules metadata

Update rule metadata (SonarSource#166)

Update travis-utils to v48

Apply rule-api 1.17.0.1017 (SonarSource#147)