chore(php-support): add support for php 5.6 and 7.1

* fix(php): add support  for php 5.6 and 7.1

* fix(actions): test actions not working with version conflict

Author: sudkumar

composer.json

@@ -24,13 +24,13 @@
         "email": "[email protected]"
     },
     "require": {
-        "php": ">=7.1",
+        "php": "^5.6|^7.1",
         "craftsys/msg91-php": "^0.8",
         "illuminate/support": "^5.2|^6.0|^7.0"
     },
     "require-dev": {
-        "orchestra/testbench": "^4.2|^5.0",
-        "phpunit/phpunit": "^8.4"
+        "orchestra/testbench": "~3.0|^4.0|^5.0",
+        "phpunit/phpunit": "^5.3|~6.0|~8.0"
     },
     "config": {
         "optimize-autoloader": true,