Use stable version

Author: jaymoulin

composer.json

@@ -18,13 +18,12 @@
     },
     "require": {
         "php": ">=5.3.0",
-        "monolog/monolog": "1.x-dev",
+        "monolog/monolog": "^1.22.0",
         "psr/log": "~1.0"
     },
     "require-dev": {
         "phpunit/phpunit": "~4.5"
     },
-    "_": "phpunit/phpunit-mock-objects required in 2.3.0 due to https://github.com/sebastianbergmann/phpunit-mock-objects/issues/223 - needs hhvm 3.8+ on travis",
     "autoload": {
         "psr-4": {"FemtoPixel\\Monolog\\": "src/Monolog"}
     },