Lock down the requested version of the react engine

Author: geoffp

packages/development-edition-engine-react/package.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "@pattern-lab/core": "^3.0.0-alpha.11",
     "@pattern-lab/engine-mustache": "^2.0.0-alpha.5",
-    "@pattern-lab/engine-react": "0.3.0",
+    "@pattern-lab/engine-react": "0.2.1-alpha.2",
     "@pattern-lab/uikit-workshop": "1.0.0-alpha.4",
     "gulp": "^3.9.1",
     "minimist": "^1.2.0",