Slack-sdk

This release includes the fixes for regression bugs in `WebClient` since v2.6.0. Refer to [v2.7.1 milestone](https://github.com/slackapi/python-slackclient/milestone/11?closed=1) to know the complete list of the issues resolved by this release.

**Updates**

1. [WebClient] 716 712 Support timeout in sync web clients - Thanks DanialErfanian seratch
2. [WebClient] 713 Support custom SSL context in sync web clients - Thanks austinbutler
3. [WebClient] 715 714 Support proxy in sync sync web clients - Thanks austinbutler seratch

Refer to [v2.7.0 milestone](https://github.com/slackapi/python-slackclient/milestone/6?closed=1) to know the complete list of the issues resolved by this release.

**New Features**

1. [WebhookClient] 707 270 531 Add `WebhookClient` for Incoming Webhooks & response_url - Thanks seratch chubz Ambro17

**Updates**

1. [WebClient] 704 695 Add `calls_*` methods to `WebClient` and `CallBlock` in Block Kit classes - Thanks seratch
2. [WebClient] 710 536 Allow Tokens to be specified per request - Thanks seratch
3. [WebClient] 709 708 Add default_to_current_conversation in conversations_select elements - Thanks seratch

Refer to [v2.6.2 milestone](https://github.com/slackapi/python-slackclient/milestone/9) to know the complete details of this release.

**Updates**

1. [WebClient] 705 WebClient's paginated API calls may fail with no params - Thanks seratch

This patch release is a quick fix for 701, a major issue that affected RTMClient users in v2.6.0. The malfunction was introduced by 667 trying to address 558 619. Those issues were reopened and will be resolved by another approach. Refer to [v2.6.1 milestone](https://github.com/slackapi/python-slackclient/milestone/8) to know the complete list of the issues resolved by this release.

**Updates**

1. [RTMClient] 701 RTMClient drops some messages when they come in rapid succession - Thanks pbrackin seratch

**New Features**

1. [Block Kit] 659 Add complete supports for Block Kit components and fixed a few existing bugs as well (500 519 623 632 635 639 676 699) - Thanks seratch diurnalist ruberVulpes jeremyschulman e271828- RodneyU215
2. [Signature] 686 Add slack.signature.SignatureVerifier for request verification - Thanks seratch
3. [WebClient] 682 Add missing Grid admin APIs (`admin.usergroups.*`, `admin.users.*`, `admin.apps.*`) - Thanks stevengill seratch

**Updates**

1. [WebClient][RTMClient] Fixed a bunch of the currency issues this SDK had (429 463 492 497 530 558 569 605 613 619 626 630 631 633 669) - Thanks seratch aaguilartablada aoberoi stevengill marshallino16
2. [WebClient] 681 560 Enable using bool values for request parameters - Thanks roman-kachanovsky seratch
3. [WebClient] 661 678 Improve handling of required "ids" parameters (e.g., channel_ids, users) - Thanks seratch
4. [WebClient] 680 Add non-conversation API deprecation warnings - Thanks seratch
5. [WebClient] 671 670 Enable passing None values for request parameters (they used to result in errors) - Thanks yuji38kwmt seratch
6. [WebClient] 673 Fix 672 files.upload fails with a filepath containing multi byte chars - Thanks yuji38kwmt seratch
7. [WebClient] 656 Fix 594 preview_image for files.remote.add API method is not properly supported - Thanks Eothred seratch
8. [Maintenance] 618 Add py.typed file to package distribution - Thanks JKillian
9. [WebClient] 599 Strip token string parameters of whitespace - Thanks TheFrozenFire
10. [WebClient] 692 Fix superfluous_charset warnings since v2.4.0 - Thanks seratch
11. [WebClient] 652 Update oauth_v2_access to include redirect_uri (as optional) - Thanks tomasreimers

Refer to [v2.6.0 milestone](https://github.com/slackapi/python-slackclient/milestone/5) to know the complete list of the issues resolved by this release.

The version is available as a pre-release on PyPI: https://pypi.org/project/slackclient/2.6.0rc2/
Refer to [v2.6.0 milestone](https://github.com/slackapi/python-slackclient/milestone/5) to know the complete list of the issues resolved by this release.

**New Features**

1. [Block Kit] 659 Add complete supports for Block Kit components and fixed a few existing bugs as well (500 519 623 632 635 639 676) - Thanks seratch diurnalist ruberVulpes jeremyschulman e271828- RodneyU215
2. [Signature] 686 Add slack.signature.SignatureVerifier for request verification - Thanks seratch
3. [WebClient] 682 Add missing Grid admin APIs (`admin.usergroups.*`, `admin.users.*`, `admin.apps.*`) - Thanks stevengill seratch

**Updates**

1. [WebClient][RTMClient] Fixed a bunch of the currency issues this SDK had (429 463 492 497 530 558 569 605 613 619 626 630 631 633 669) - Thanks seratch aaguilartablada aoberoi stevengill marshallino16
2. [WebClient] 681 560 Enable using bool values for request parameters - Thanks roman-kachanovsky seratch
3. [WebClient] 661 678 Improve handling of required "ids" parameters (e.g., channel_ids, users) - Thanks seratch
4. [WebClient] 680 Add non-conversation API deprecation warnings - Thanks seratch
5. [WebClient] 671 670 Enable passing None values for request parameters (they used to result in errors) - Thanks yuji38kwmt seratch
6. [WebClient] 673 Fix 672 files.upload fails with a filepath containing multi byte chars - Thanks yuji38kwmt seratch
7. [WebClient] 656 Fix 594 preview_image for files.remote.add API method is not properly supported - Thanks Eothred seratch
8. [Maintenance] 618 Add py.typed file to package distribution - Thanks JKillian
9. [WebClient] 599 Strip token string parameters of whitespace - Thanks TheFrozenFire
10. [WebClient] 692 Fix superfluous_charset warnings since v2.4.0 - Thanks seratch