1.5.1

• [fix] Avoid swallowing exceptions thrown by user event handlers (#2682)
• [test] Use client function to unify client in test script (#2731)
• [docs] Add link to LICENSE (#2221)
• [docs] Fix JSDoc of optional parameters (#2465)
• [docs] Fix typo (#2724)
• [docs] Link readme npm package badge to npm registry page (#2612)
• [docs] Minor fixes (#2526)
• [chore] Bump socket.io-parser to 2.3.0 (#2730)
• [chore] Add Github issue and PR templates (#2733)
• [chore] Bump engine.io to 1.7.2 (#2729)
• [chore] Bump socket.io-parser to 2.3.1 (#2734)