fix(package): update semver to version 5.4.0 (#4044)

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "pg-promise": "6.3.1",
     "redis": "2.8.0",
     "request": "2.81.0",
-    "semver": "5.3.0",
+    "semver": "5.4.0",
     "tv4": "1.3.0",
     "winston": "2.3.1",
     "winston-daily-rotate-file": "1.4.6",