Drop php 5 support

Author: moux2003

.travis.yml

@@ -14,11 +14,10 @@ matrix:
           # Minimum supported dependencies with the latest and oldest PHP version
         - php: 7.2
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" SYMFONY_DEPRECATIONS_HELPER="weak_vendors"
-        - php: 5.6
+        - php: 7.0
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest" SYMFONY_DEPRECATIONS_HELPER="weak_vendors"
 
           # Test the latest stable release
-        - php: 5.6
         - php: 7.0
         - php: 7.1
         - php: 7.2

composer.json

@@ -15,7 +15,7 @@
         }
     ],
     "require": {
-        "php": ">=5.6",
+        "php": ">=7.0.0",
         "sendgrid/sendgrid": "^7.0",
         "symfony/swiftmailer-bundle": "~3.2",
         "symfony/framework-bundle": "~2.7|~3.3|~4.0",