Use the caret instead of the tilde for require-dev dependencies.

Author: tomzx

composer.json

@@ -30,8 +30,8 @@
 		"tomzx/finder": "^0.1"
 	},
 	"require-dev": {
-		"mockery/mockery": "~0.9",
-		"phpunit/phpunit": "~4.0|~5.0"
+		"mockery/mockery": "^0.9",
+		"phpunit/phpunit": "^4.0|^5.0"
 	},
 	"bin": [
 		"bin/php-semver-checker"