Move loglevel from devDependencies to dependencies (#1001)

Author: athomann

package.json

@@ -17,6 +17,7 @@
     "html-entities": "^1.2.0",
     "http-proxy-middleware": "~0.17.4",
     "internal-ip": "^1.2.0",
+    "loglevel": "^1.4.1",
     "opn": "4.0.2",
     "portfinder": "^1.0.9",
     "selfsigned": "^1.9.1",
@@ -38,7 +39,6 @@
     "jquery": "^2.2.0",
     "less": "^2.5.1",
     "less-loader": "~2.2.0",
-    "loglevel": "^1.4.1",
     "mocha": "^3.0.2",
     "mocha-sinon": "^1.1.6",
     "pug": "^2.0.0-beta5",