Revert "updated composer to accomodate newer versions of apimatic"

This reverts commit e01faa0.

Author: Ofego Edafe

composer.json

@@ -26,7 +26,7 @@
         "ext-json": "*",
         "ext-mbstring": "*",
         "mashape/unirest-php": "~3.0.1",
-        "apimatic/jsonmapper": ">=1.3.0"
+        "apimatic/jsonmapper": "~1.3.0"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^2.7"