Include a non-dev dep on semver, missed in v3.7.2

Author: pimterry

package.json

@@ -143,7 +143,6 @@
     "request": "^2.75.0",
     "request-promise-native": "^1.0.3",
     "rimraf": "^2.5.4",
-    "semver": "^5.5.0",
     "source-map-support": "^0.5.3",
     "stream-browserify": "^3.0.0",
     "tmp-promise": "^1.0.3",
@@ -195,6 +194,7 @@
     "performance-now": "^2.1.0",
     "portfinder": "1.0.28",
     "read-tls-client-hello": "^1.0.0",
+    "semver": "^5.7.1",
     "socks-proxy-agent": "^7.0.0",
     "typed-error": "^3.0.2",
     "uuid": "^8.3.2",