Move black installation

This is just to avoid installing in case the CI fails beforehand.

Author: drvinceknight

.github/workflows/config.yml

@@ -37,8 +37,6 @@ jobs:
       run: |
         python -m pip install coverage
         python -m pip install hypothesis==3.2
-        python -m pip install mypy
-        python -m pip install black
     - name: Run tests
       run: |
         python -m pip install coverage
@@ -66,6 +64,7 @@ jobs:
         python -m pylint --disable=all --enable=unused-import axelrod/strategies/_strategies.py
     - name: Check format
       run: |
+        python -m pip install black
         python -m black -l 80 . --check
     - name: Check that installs
       run: |