improve api, readmes, overlayscrollbars-react and finish overlayscrollbars-vue

packages/overlayscrollbars-react/tsconfig.json

@@ -10,6 +10,7 @@
     "baseUrl": ".",
     "paths": {
       "~/*": ["./src/*"]
-    }
+    },
+    "types": ["jest", "@testing-library/jest-dom"]
   }
 }