Merge pull request #753 from paulkaplan/fix-travis-again

Fix travis again by pinning chromedriver and selenium versions

package.json

@@ -39,7 +39,7 @@
     "babel-plugin-transform-object-rest-spread": "^6.22.0",
     "babel-preset-es2015": "^6.22.0",
     "babel-preset-react": "^6.22.0",
-    "chromedriver": "^2.32.3",
+    "chromedriver": "2.32.3",
     "classnames": "2.2.5",
     "copy-webpack-plugin": "^4.0.1",
     "css-loader": "^0.28.7",
@@ -86,7 +86,7 @@
     "scratch-render": "latest",
     "scratch-storage": "^0.2.0",
     "scratch-vm": "latest",
-    "selenium-webdriver": "^3.5.0",
+    "selenium-webdriver": "3.5.0",
     "startaudiocontext": "1.2.1",
     "style-loader": "^0.18.0",
     "svg-to-image": "1.1.3",