Bumped min required PHP version

Author: vgarvardt

.github/workflows/testing.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '5.6'
+          php-version: '7.0'
           tools: composer:v1
       - name: Install composer deps
         run: composer update ${{ matrix.composer }} -n

composer.json

@@ -21,7 +21,7 @@
     }
   },
   "require": {
-    "php": ">= 5.6",
+    "php": ">= 7.0",
     "psr/http-message": "^1.0",
     "behat/transliterator": "^1.2",
     "psr/log": "^1.0"