v3.4.0
Improving the dev workflow: Setup browserstack, add necessary configuration files and tests for mobile (#5340)
M2.1 (Helping learners when they get stuck): Add state migration for new customization_arg catchMisspellings. (#16077)
Fixes bug in the voiceover admin page (#20141)
Adds readme to various folders (#8329)
Moving sample classifiers, explorations and widgets to a separate directory.