fix(dependencies): add rxjs to the production dependencies list

Author: trxcllnt

package.json

@@ -47,7 +47,8 @@
   "dependencies": {
     "@types/node": "^10.12.18",
     "is-stream": "1.1.0",
-    "tslib": "^1.9.3"
+    "tslib": "^1.9.3",
+    "rxjs": "5.5.11"
   },
   "devDependencies": {
     "@mattiasbuelens/web-streams-polyfill": "0.2.1",
@@ -88,7 +89,6 @@
     "pre-git": "3.17.1",
     "prettier": "1.15.3",
     "rimraf": "2.6.3",
-    "rxjs": "5.5.11",
     "shx": "0.3.2",
     "source-map-loader": "0.2.4",
     "terser-webpack-plugin": "1.2.1",