Opening up versions a little

Author: jimmypuckett

composer.json

@@ -21,11 +21,11 @@
         "swiftmailer/swiftmailer": "~5.1"
     },
     "require-dev": {
-        "mockery/mockery": "~0.9.1",
-        "phpunit/phpunit": "~4.0",
-        "psy/psysh": "~0.5.1",
-        "satooshi/php-coveralls": "~0.6.1",
-        "symfony/var-dumper": "~2.7|3.0.*"
+        "mockery/mockery": "v0.9.1",
+        "phpunit/phpunit": "~4.0|~5.0",
+        "psy/psysh": "^0.5.1",
+        "satooshi/php-coveralls": "^0.6.1",
+        "symfony/var-dumper": "~2.7|~3.0"
     },
     "autoload": {
         "psr-4": {