Drop 3.7 support

Author: spyoungtech

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10']
+        python: ['3.8', '3.9', '3.10']
 
     steps:
       - name: Checkout
@@ -34,7 +34,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10', '3.11-dev']
+        python: ['3.8', '3.9', '3.10', '3.11-dev']
         check_formatting: ['0']
         extra_name: ['']
         include:
@@ -70,7 +70,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python: ['3.7', '3.8', '3.9', '3.10']
+        python: ['3.8', '3.9', '3.10']
     steps:
       - name: Checkout
         uses: actions/checkout@v2