Update CI builds

Author: seratch

.github/workflows/ci-build.yml

@@ -35,11 +35,16 @@ jobs:
         pytest tests/adapter_tests/
     - name: Run async tests
       run: |
-        pip install -e ".[async]"
-        pip install "pytest-asyncio<1"
-        pytest tests/slack_bolt_async/
-        pytest tests/scenario_tests_async/
-        pytest tests/adapter_tests_async/
+        # As the tests here are often slow on GitHub Actions,
+        # we pick up only one Python version for it.
+        python_version=`python -V`
+        if [ ${python_version:7:3} == "3.9" ]; then
+          pip install -e ".[async]"
+          pip install "pytest-asyncio<1"
+          pytest tests/slack_bolt_async/
+          pytest tests/scenario_tests_async/
+          pytest tests/adapter_tests_async/
+        fi
     - name: Run pytype verification & codecov
       run: |
         python_version=`python -V`

README.md

@@ -2,7 +2,7 @@
 
 [![Python Version][python-version]][pypi-url]
 [![pypi package][pypi-image]][pypi-url]
-[![Build Status][travis-image]][travis-url]
+[![Build Status][build-image]][build-url]
 [![Codecov][codecov-image]][codecov-url]
 
 A Python framework to build Slack apps in a flash with the latest platform features. Read the [getting started guide](https://slack.dev/bolt-python/tutorial/getting-started) and look at our [code examples](https://github.com/slackapi/bolt-python/tree/main/examples) to learn how to build apps using Bolt.
@@ -156,8 +156,8 @@ If you otherwise get stuck, we're here to help. The following are the best ways
 
 [pypi-image]: https://badge.fury.io/py/slack-bolt.svg
 [pypi-url]: https://pypi.org/project/slack-bolt/
-[travis-image]: https://travis-ci.org/slackapi/bolt-python.svg?branch=main
-[travis-url]: https://travis-ci.org/slackapi/bolt-python
+[build-image]: https://github.com/slackapi/bolt-python/workflows/CI%20Build/badge.svg
+[build-url]: https://github.com/slackapi/bolt-python/actions?query=workflow%3A%22CI+Build%22
 [codecov-image]: https://codecov.io/gh/slackapi/bolt-python/branch/main/graph/badge.svg
 [codecov-url]: https://codecov.io/gh/slackapi/bolt-python
 [python-version]: https://img.shields.io/pypi/pyversions/slack-bolt.svg