Update minimum PHP version to 7.1

Author: srenon

.github/workflows/php.yml

@@ -8,4 +8,4 @@ jobs:
     - name: PHPCS
       run: docker run --rm -v $PWD:/code:ro domw/phpcs phpcs --colors --standard=Magento2 --report=full,summary,gitblame --extensions=php,phtml ./
     - name: compatibility
-      run: docker run --rm -v $PWD:/code:ro domw/phpcompatibility phpcs --standard=PHPCompatibility --runtime-set testVersion 5.6-7.4 --colors --warning-severity=0 --report=full,summary --extensions=php,phtml ./
+      run: docker run --rm -v $PWD:/code:ro domw/phpcompatibility phpcs --standard=PHPCompatibility --runtime-set testVersion 7.1-7.4 --colors --warning-severity=0 --report=full,summary --extensions=php,phtml ./

composer.json

@@ -9,7 +9,7 @@
         "admin reindex"
     ],
     "require": {
-        "php": "7.0.2|7.0.4|~7.0.6|~7.1.0|~7.1.3|~7.2.0|~7.3.0|~7.4.0",
+        "php": "~7.1.0|~7.1.3|~7.2.0|~7.3.0|~7.4.0",
         "magento/module-backend": "100.0.*|100.1.*|100.2.*|101.0.*|102.0.*",
         "magento/framework": "100.0.*|100.1.*|101.0.*|102.0.*|103.0.*",
         "magepal/magento2-core":">1.1.8"