Run CI on PHP >= 7.3

Author: Slamdunk

.github/workflows/continuous-integration.yml

@@ -20,7 +20,6 @@ jobs:
     strategy:
       matrix:
         php-version:
-          - "7.2"
           - "7.3"
           - "7.4"
           - "8.0"
@@ -30,7 +29,7 @@ jobs:
           - true
           - false
         include:
-          - php-version: "7.2"
+          - php-version: "7.3"
             dependencies: "lowest"
 
     services: