v1.5

What's new:

• NUSKattis class to access nus.kattis.com counterparts
• Three new methods:
  • problem_authors to list down all authors
  • problem_sources to list down all sources, e.g. ICPC
  • achievements to list down all achievements (new UI update! 😄)
• problem has more new columns instead of just having a unified metadata column
• Bugfixes to handle the new UI and NUS Kattis behaviors
• Bugfix on dependency between pandas and seaborn
• New testing script

Full Changelog: v1.4.11...v1.5