chore(deps): update dependency semver to v5.6.0

Author: renovate-bot

package.json

@@ -44,7 +44,7 @@
     "mocha": "5.2.0",
     "phantomjs-prebuilt": "2.1.16",
     "prettier": "1.14.3",
-    "semver": "5.5.1",
+    "semver": "5.6.0",
     "should": "13.2.3",
     "ts-loader": "5.2.1",
     "tslint": "5.11.0",