v3.3.0
Fix #16324: Enter key submits the answer in math expression input (#16939)
Milestone 1.3 and 1.4: Add Algebraic Expression Input Interaction (#9553)
Added Mypy type annotations to the `extensions` directory. (#16083)
Milestone 1.1 (Improve line and branch coverage for the frontend and the backend): Checks to ensure that every backend file has an associated test file (#15625)
Introduce angular router (#13305)
Milestone 1.2 (Migrate away from protractor): Setup webdriverio and migrate few tests suite from protractor to webdriverIO (#15614)