feat: drop support for php 7.1

.github/workflows/main.yml

@@ -3,15 +3,15 @@ on: push
 
 jobs:
   code-quality:
-    name: Run code quality checks on PHP 7.1
+    name: Run code quality checks on PHP 7.2
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '7.1'
+          php-version: '7.2'
       - name: Get Composer Cache Directory
         id: composer-cache
         run: |
@@ -35,7 +35,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php-versions: ['7.1', '7.2', '7.3', '7.4']
+        php-versions: ['7.2', '7.3', '7.4']
     steps:
       - name: Checkout code
         uses: actions/checkout@v2

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": ">=7.1",
+        "php": ">=7.2",
         "ext-json": "*"
     },
     "require-dev": {