Update pre-commit & build

.github/workflows/build.yml

@@ -22,10 +22,10 @@ jobs:
         awk -F '\/' '{ print tolower($2) }' |
         tr '_' '-'
         )
-    - name: Set up Python 3.7
+    - name: Set up Python 3.x
       uses: actions/setup-python@v1
       with:
-        python-version: 3.7
+        python-version: 3.x
     - name: Versions
       run: |
         python3 --version
@@ -42,11 +42,16 @@ jobs:
       # (e.g. - apt-get: gettext, etc; pip: circuitpython-build-tools, requirements.txt; etc.)
       run: |
         source actions-ci/install.sh
-    - name: Pip install Sphinx
+    - name: Pip install pylint, Sphinx, pre-commit
       run: |
-        pip install --force-reinstall Sphinx sphinx-rtd-theme sphinx-autoapi
+        pip install --force-reinstall pylint Sphinx sphinx-rtd-theme pre-commit sphinx-autoapi
     - name: Library version
       run: git describe --dirty --always --tags
+    - name: Setup problem matchers
+      uses: adafruit/circuitpython-action-library-ci-problem-matchers@v1
+    - name: Pre-commit hooks
+      run: |
+        pre-commit run --all-files
     - name: Clone and build circuitpython unix port
       run: |
         set -e