Slack-sdk

**New Features**

1. [WebClient] Adding new admin.* Web API methods. 571

**Updates**
1. [WebClient] We're no longer validating token types for Web API methods. Improves compatibility with granular bot permisisons. 568 (Thanks Smotko)
2. [WebClient] Correcting typos in descriptions 554 (Thanks phamk)
3. [WebClient] Fixed 'iteracting' typo in library file headers 564 (Thanks acabey)
4. [Message Builders] Remove value from LinkButtonElement 563 (Thanks pedroma)

**Updates**
1. [WebClient] Fixing a regression that causes the client to close sessions prematurely. 544 (Thanks fatih-acar!)
2. [WebClient] Adding required missing view param to `views.update` Web API method. 542

**New Features**

1. [WebClient] Adding new views.publish Web API method. 540

**Updates**

1. [WebClient] Some server responses don't return json. Correcting initial assumption. 540
2. [Maintenance] Add py.typed to mark the library to support type hinting 524

**Updates**
1. [Docs] Fix Indentation of Code Snippets in README.md 525 (Thanks abhishekjiitr)
2. [WebClient] Fix Web Client custom iterator 521 (Thanks smaeda-ks)
3. [WebClient] Oauth previously failed to pass along credentials properly. This is fixed now. 527
4. [WebClient] When a SlackApiError occurs we're now passing the entire SlackResponse into the exception. 527

**New Features**
1. [WebClient] Adding new admin and remote files API methods. 501
2. [WebClient] Adding new view API methods. 517

**Updates**
1. [Message Builders] Update BlockAttachment to not send invalid JSON due to fields attribute 473 (Thanks paul-griffith)
2. [Docs] Add RTM section for docs v2 477 (Thanks shanedewael)
3. [Docs] Fix typo; recieved -> received 478 (Thanks joakimnordling)
4. [Docs] Fix block kit link & update docs 484 (Thanks clavin)
5. [RTMClient] Return callback from `RTMClient.run_on` 490 (Thanks clavin)
6. [Docs] Fix link to Auth Guide in readme 498 (Thanks asherf)
7. [Docs] Fix missing word and typo 512 (Thanks marks)
8. [Message Builders] bugfix for value length in button elements 514 (Thanks avanderm)
9. [Docs] Fixes formatting 515 (Thanks vpetersson)
10. [Docs] Improve a code snippet on README 516 (Thanks seratch)
11. [WebClient] Fixed an OAuth Headers bug and made the `token` param optional. 517

**New Features**
1. Type-hinted helper classes for building messages in v2 400 (Thanks paul-griffith)

**Breaking Changes**
1. [RTMClient] Converted the `RTMClienttyping()` function to async 446

**Updates**
1. [RTMClient] Handle case in which aiohttp closes the websocket due to lack of ping responses. 453 (Thanks flyte)
2. Modify package identifier in user agent to match v1.x identifier 418 (Thanks aoberoi)
3. [WebClient] Fixed typo in Scheduled message 428 & 435 (Thanks splinterific)
4. Transform install_requires of 'aiodns' into extras_require. 440 (Thanks staticdev)

**Thank you!!**
To everyone who's opened, commented or reacted to an issue; this project is better because of you!
Thank you for helping the Slack community!