fix(package): update semver to version 5.5.0 (#4504)

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "pg-promise": "7.4.0",
     "redis": "2.8.0",
     "request": "2.83.0",
-    "semver": "5.4.1",
+    "semver": "5.5.0",
     "tv4": "1.3.0",
     "uuid": "^3.1.0",
     "winston": "2.4.0",