Revert "upgrade react-bootstrap version in playground to match bootstrap 4"

This reverts commit e9e8938.

Author: epicfaace

packages/playground/package.json

@@ -58,7 +58,7 @@
     "lodash": "^4.17.15",
     "prop-types": "^15.7.2",
     "react-app-polyfill": "^1.0.4",
-    "react-bootstrap": "^1.3.0",
+    "react-bootstrap": "^0.33.1",
     "react-frame-component": "^4.1.1",
     "react-is": "^16.9.0",
     "shortid": "^2.2.14"