chore(package): update leakage to version 0.5.0

Closes #157

Author: greenkeeper[bot]

package.json

@@ -107,7 +107,7 @@
     "karma-sinon-chai": "1.3.3",
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "2.0.5",
-    "leakage": "0.3.0",
+    "leakage": "0.5.0",
     "loadtest": "2.3.0",
     "mkdirp": "0.5.1",
     "mocha": "4.0.1",