fix: rxjs conflicting type signatures

Author: James Salas

packages/example-app/package.json

@@ -32,7 +32,7 @@
     "redux": "^4.0.1",
     "redux-logger": "^3.0.1",
     "redux-observable": "^1.0.0",
-    "rxjs": "^6.3.3",
+    "rxjs": "6.2.1",
     "zone.js": "^0.8.9"
   },
   "devDependencies": {

yarn.lock

@@ -9194,7 +9194,7 @@ rx-lite@^3.1.2:
 
 rxjs@6.2.1:
   version "6.2.1"
-  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.2.1.tgz#246cebec189a6cbc143a3ef9f62d6f4c91813ca1"
+  resolved "http://localhost:4873/rxjs/-/rxjs-6.2.1.tgz#246cebec189a6cbc143a3ef9f62d6f4c91813ca1"
   integrity sha512-OwMxHxmnmHTUpgO+V7dZChf3Tixf4ih95cmXjzzadULziVl/FKhHScGLj4goEw9weePVOH2Q0+GcCBUhKCZc/g==
   dependencies:
     tslib "^1.9.0"