Simplied GitHub actions

Author: aaltat

.github/workflows/CI.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       matrix:
         python-version: [2.7, 3.6, 3.7, 3.8]
-        rf-version: [3.1.2, 3.2dev]
+        rf-version: [3.1.2, 3.2rc1]
 
     steps:
     - uses: actions/checkout@v2
@@ -21,14 +21,9 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements-dev.txt
-    - name: Install RF from master
+    - name: Install RF ${{ matrix.rf-version }}
       run: |
-        pip install https://github.com/robotframework/robotframework/archive/master.zip
-      if: matrix.rf-version == '3.2dev'
-    - name: Install RF 3.2.1
-      run: |
-        pip install robotframework==${{ matrix.rf-version }}
-      if: matrix.rf-version == '3.1.2'
+        pip install -U --pre robotframework==${{ matrix.rf-version }}
     - name: Run flake8
       run: |
         flake8 --max-line-length=110 src/