Add support for immer 5.x

Closes #44

package.json

@@ -39,6 +39,6 @@
         "typescript": "~3.5.2"
     },
     "dependencies": {
-        "immer": "^1.4.0 || ^2.0.0 || ^3.0.0 || ^4.0.0"
+        "immer": "^1.4.0 || ^2.0.0 || ^3.0.0 || ^4.0.0 || ^5.0.0"
     }
 }