Add a config file for vermin

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
           pytest
       - name: Validate minimum required version
         run: |
-          vermin --target=3.7 --no-tips .
+          vermin toot
       - name: Check style
         run: |
           flake8

.vermin

@@ -0,0 +1,4 @@
+[vermin]
+only_show_violations = yes
+show_tips = no
+targets = 3.7

Makefile

@@ -10,7 +10,7 @@ publish :
 test:
 	pytest -v
 	flake8
-	vermin --target=3.7 --no-tips --violations --exclude-regex venv/.* .
+	vermin toot
 
 coverage:
 	coverage erase