Don't allow React >=16.0.0-alpha

Can't run tests due to facebook/react#9102

package.json

@@ -27,7 +27,7 @@
     "shallow-equal": "^1.0.0"
   },
   "peerDependencies": {
-    "react": ">=0.14.7 || >=16.0.0-alpha.2"
+    "react": "^0.14.7 || ^15.0.1"
   },
   "devDependencies": {
     "autoprefixer": "^6.7.5",
@@ -59,9 +59,9 @@
     "nyc": "^10.1.2",
     "openurl": "^1.1.1",
     "postcss-loader": "^1.3.2",
-    "react": "^16.0.0-alpha.2",
-    "react-addons-test-utils": "^16.0.0-alpha.2",
-    "react-dom": "^16.0.0-alpha.2",
+    "react": "^15.4.2",
+    "react-addons-test-utils": "^15.4.2",
+    "react-dom": "^15.4.2",
     "react-modal": "^1.6.5",
     "react-transform-hmr": "^1.0.4",
     "sinon": "^1.17.7",