1.91

• fix number quiz input #413
• add firebase performance SDK #414
• add PyCharm quiz support #415
• fix crashes in choice quiz #416

1.90

• redesign sorting quiz #402
• fix evaluation animation on Android 4 #403
• move certificates to profile #404
• set default streak reminder time #405
• remove table quiz support #406
• redesign matching quiz #407
• optimize request for personal deadlines #408
• update ktlint #409
• redesign course list items #410
• redesign unsupported quiz #411

1.89

• removed all the remaining ab tests #381
• merge section dates with deadlines #382
• drop SDK 15 support #383
• remove fill blanks quiz support #384
• add time to complete in lessons list #385
• add rating dialog to new step container #386
• add local submissions #387
• fix tooltips #388
• switch to KaTeX #389
• minify hightlight.js #390
• fix empty reviews for enrolled courses #391
• handle links in choice options #392
• update lesson info tooltip #393, #394
• add streak dialog to new step container #395
• add peer review to new step container #396
• fix step error handling #397
• handle links in hints #398
• add next button to new step container #399

1.87

• new text quizes #373
• add LaTeX support for step quiz hint #374
• add data layer for comments #375
• new choice quiz #376

1.86

• fix step's images aspect ratio #368
• update step container and migrate text step #369
• add social links #370
• migrate video step #371

1.85

• fix course ratings on main screen #362
• disable MailRu login #365
• replace zendesk with support email #366

1.84

• notifications refactor #360
• new lesson container #361

1.83

• fix date serialisations issues #356
• fix buy in web action #357
• keep 1 min buffer of watched content #358

1.82

• fix fullscreen code change #343
• change icon color to black #347
• remove personal deadlines ab #348
• restart achievements ab #349 #352
• fix achievements push notifications #350
• fix catalog recycling #351
• add ability to write course reviews #353
• disable IAP #354

1.81

• add A/B test with comments tooltip #339
• fix stories memory leak #342
• add profile edit #344
• fix audio playback in WebView #345