Delete php 7.1 from matrix

Author: Smolevich

.github/workflows/build-ci.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ${{matrix.os}}
     strategy:
       matrix:
-        php: ['7.1', '7.2', '7.3', '7.4']
+        php: ['7.2', '7.3', '7.4']
         os: ['ubuntu-latest']
         mongodb: ['3.6', '4.0', '4.2']
     services: