prepping for 1.1.0-beta release

- Updating and documenting changelog creation process.
  antsibull-changelog was chosen because it is the standard tooling
  recommended by Ansible developers.
- Documenting the release process and several others so others can perform it in the
  future.
- Updating the integration tests to test against 2.13, which the 1.1.0
  final release will be certified for.
- Created changelog and update galaxy.yaml for 1.1.0-beta, which will be
  the next release.

.github/workflows/ansible-integration-tests.yml

@@ -19,8 +19,7 @@ jobs:
     strategy:
       matrix:
         ansible_version:
-          # - stable-2.13
-          - stable-2.11
+          - stable-2.13
     steps:
       - name: check out code
         uses: actions/checkout@v2
@@ -29,7 +28,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v1
         with:
-          python-version: '3.8'  # this is the minimum version required for Ansible 2.11
+          python-version: '3.8'  # this is the minimum version required for Ansible 2.13
       - name: Install dependencies
         run: pip install -r requirements.txt
       - name: Install ansible-base (${{ matrix.ansible_version }})

.github/workflows/ansible-test.yml

@@ -39,6 +39,7 @@ jobs:
         ansible_version:
           - stable-2.13
           - stable-2.11
+          - stable-2.9
     steps:
       - name: check out code
         uses: actions/checkout@v2