Merge pull request #905 from dilshans2k/bugfix/drafty-should-correctly-parse-message-content-for-push-notification

fix: #904 drafty should correctly parse message content for push notification

- it will panic on g.Reset, if nil

- use go commenting guidelines
- reset grapheme iterator only once
- small refactors

CORS for media API

Add CORS HTTP headers to regular (non-OPTIONS) requests

Merge branch 'bugfix/cors-for-upload-api' of https://github.com/markeloff86/tinode-chat into bugfix/cors-for-upload-api

# Conflicts:
#	server/media/media.go

chore: fix function names in comment

Signed-off-by: goodfirm <fanyishang@yeah.net>

- instead of []rune, text is treated as []grapheme cluster
- added ut

Update README.md