Merge pull request #23 from share/bump-sharedb

⬆️ Support later versions of `sharedb`

Author: alecgibson

package.json

@@ -21,6 +21,6 @@
   "dependencies": {
     "pg": "^8.5.1",
     "pg-pool": "^3.2.1",
-    "sharedb": "^1.6.0"
+    "sharedb": "^1.6.0 || ^2.0.0 || ^3.0.0 || ^4.0.0 || ^5.0.0"
   }
 }