fix(package): move unused deps to optionalDeps

package.json

@@ -6,16 +6,13 @@
   "dependencies": {
     "babel-polyfill": "^6.26.0",
     "body-parser": "^1.18.2",
-    "chalk": "^2.3.1",
     "chokidar": "^2.0.2",
     "compression": "^1.7.2",
     "cookie-parser": "^1.4.3",
     "express": "^4.16.2",
     "helmet": "^3.11.0",
     "history": "^4.7.2",
     "isomorphic-fetch": "^2.2.1",
-    "js-cookie": "^2.2.0",
-    "jsonwebtoken": "^8.1.1",
     "lodash": "^4.17.5",
     "morgan": "^1.9.0",
     "offline-plugin": "^4.9.0",
@@ -128,7 +125,9 @@
     "query-string": "^5.1.0",
     "reselect": "^3.0.1",
     "store2": "^2.7.0",
-    "sinon": "^4.3.0"
+    "js-cookie": "^2.2.0",
+    "sinon": "^4.3.0",
+    "chalk": "^2.3.1"
   },
   "scripts": {
     "build": "npm run frontend_build && npm run server_build",