update docs

Author: gignac-cha

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## v3.0.154(JUL 6, 2021)
+## v3.0.154(AUG 6, 2021)
 - Added `metadataKey`, `metadataValues` and `metadataValueStartsWith` in `GroupChannelListQuery` and `PublicGroupChannelListQuery`.
 - Optimized Supergroup protocol handling to improve performance for specific use cases.
 - Improved stability.

README.md

@@ -325,7 +325,7 @@ The `sb.setErrorFirstCallback(false)` returns callbacks to their original parame
 
 ## Changelogs
 
-### v3.0.154(JUL 6, 2021)
+### v3.0.154(AUG 6, 2021)
 
 If you want to check the record of other versions, go to [Change Log](https://github.com/sendbird/Sendbird-SDK-JavaScript/blob/master/CHANGELOG.md).