Merge pull request #30 from share/rich-text-dep

➕ Add `rich-text` as a dev dependency

Author: alecgibson

package.json

@@ -30,6 +30,7 @@
     "mocha": "^6.2.2",
     "nyc": "^14.1.1",
     "ot-json1": "^1.0.1",
+    "rich-text": "^4.1.0",
     "sharedb": "^3.0.0 || ^4.0.0",
     "sinon": "^11.1.2"
   },