Move coveralls to dev dependency

composer.json

@@ -23,15 +23,15 @@
         "illuminate/container": "^5.8|^6.0",
         "illuminate/database": "^5.8|^6.0",
         "illuminate/events": "^5.8|^6.0",
-        "mongodb/mongodb": "^1.4",
-        "cedx/coveralls": "^11.2"
+        "mongodb/mongodb": "^1.4"
     },
     "require-dev": {
         "phpunit/phpunit": "^6.0|^7.0|^8.0",
         "orchestra/testbench": "^3.1|^4.0",
         "mockery/mockery": "^1.0",
         "doctrine/dbal": "^2.5",
-        "phpunit/phpcov": "^6.0"
+        "phpunit/phpcov": "^6.0",
+        "cedx/coveralls": "^11.2"
     },
     "autoload": {
         "psr-0": {