Update phpbrake to 0.3.1

Author: k1LoW

composer.json

@@ -21,7 +21,7 @@
     },
     "require": {
         "guzzlehttp/guzzle": ">=5.3,<7.0",
-        "airbrake/phpbrake": "^0.2.0"
+        "airbrake/phpbrake": "^0.3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0",