Make fake revision comply with PEP 440

Author: tekktrik

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Install locally
       run: |
         for file in $(find -not -path "./.*" -not -path "./docs*" \( -name "*.py" -o -name "*.toml" \) ); do
-            sed -i -e "s/0.0.0-auto.0/1.2.3-testrev/" $file;
+            sed -i -e "s/0.0.0-auto.0/1.2.3.testrev/" $file;
         done;
         pip install .
     - name: Run tests