Implement progress_callback for sending albums (33c5ee9 by Lonami)
Remove dead code from send_file (0f7756a by Lonami)

Periodically save update state (#4071) (68ea208 by Kacnep89)

Include Telethon version on fatal errors during updates (f9001bc by Lonami)
Update FAQ (3e64ea3 by Lonami)
Remove redundant entity cache (f7e38ee by Lonami)
Remove now-unused EntityCache class (d1e3237 by Lonami)
Fix _get_entity_pair could receive None as input (cb04e26 by Lonami)
Flush in-memory cache to session after a limit is reached (97b0ba6 by Lonami)
Store self user in entity cache (88bc6a4 by Lonami)
Save self user ID in session file (a657ae0 by Lonami)
Update FAQ (fd09284 by Lonami)
Handle PhoneCodeExpiredError during sign_in (af18538 by Lonami)

Version 1.28 (view new and changed raw API methods)

Bump to v1.28.0 (10c74f8 by Lonami)

Properly handle PhoneCodeExpiredError in sign_in (5b11357 by Lonami)

Fix editing inline messages of type InputBotInlineMessageID64 (#4082) (ced36ad by nitanmarcel)

Fix documentation typo (#4086) (acec8a7 by SsNiPeR1)

Declare missing exception variable (#4087) (d419979 by Polaris-d)

Save photos as progressive when uploading (#4089) (7b1b33f by Nick80835)

Allowing nosound_video to be specified (#4090) (6e7423e by Deer-Spangle)

Update to layer 158 (9aad453 by Lonami)

Improve unhelpful 'readexactly size can not be less than zero' (03ff996 by Lonami)

Exit receive loop on IOError or unhandled exceptions (ccf67d0 by Lonami)

Fix ValueError during connect with catchup on bad cache (d7bd554 by Lonami)

Fix UserUpdate.last_seen check (ce29f13 by Lonami)

Fix absolute import should be relative (#4101) (9c7ac3b by redacted-text)

except and propagate TypeNotFoundError during update handling (2889bd5 by Lonami)

Better document breaking ToS will lead to bans (c4a41ad by Lonami)