Fix prop-types dependency placement

Author: fritz-c

package.json

@@ -30,12 +30,12 @@
   ],
   "license": "MIT",
   "dependencies": {
+    "prop-types": "^15.5.8",
     "react-modal": "^1.4.0"
   },
   "peerDependencies": {
-    "prop-types": "^15.5.8",
-    "react": "^15.0.0",
-    "react-dom": "^15.0.0"
+    "react": "^15.5.0",
+    "react-dom": "^15.5.0"
   },
   "devDependencies": {
     "autoprefixer": "^6.3.7",
@@ -57,6 +57,7 @@
     "file-loader": "^0.9.0",
     "gh-pages": "^0.12.0",
     "html-webpack-plugin": "^2.22.0",
+    "isomorphic-style-loader": "^2.0.0",
     "node-sass": "^3.8.0",
     "postcss-loader": "^1.1.0",
     "prop-types": "^15.5.8",
@@ -65,7 +66,6 @@
     "react-hot-loader": "^1.3.0",
     "rimraf": "^2.5.3",
     "sass-loader": "^4.0.0",
-    "isomorphic-style-loader": "^2.0.0",
     "webpack": "^1.13.1",
     "webpack-dev-server": "^1.14.1"
   },