Features:

• Improved error handling
• RateLimitException for rate limit request handling.
• HttpExecutor error handling improved.
• QueueManager improved
• Gradle 6.7 instead of Maven
• GitHub CI
• Sonarcloud analyzer
• Dependencies updated for JUnit and Gson.
• Codestyle added.

Fixes:

• QueueManager provided for token user and non token one fixed.
• QueueManager non token impl fixed.
• Tests fixed and reinforced.