Pin buble to 0.19.4

#106
FormidableLabs/react-live#105
bublejs/buble#159

Author: johno

.npmrc

@@ -42,6 +42,7 @@
     "babel-preset-stage-0": "^6.24.1",
     "babel-register": "^6.26.0",
     "browser-env": "^3.2.5",
+    "buble": "0.19.4",
     "chalk": "^2.4.1",
     "clipboardy": "^1.2.3",
     "connect-history-api-fallback": "^1.5.0",

package.json

@@ -152,7 +152,7 @@ Generated by [AVA](https://ava.li).
         />
       </div>,
       <div
-        className="sc-fYxtnH gSsCHS sc-bwzfXH hKiLMS sc-bdVaJa iHZvIS"
+        className="sc-fYxtnH bWUyfK sc-bdVaJa iHZvIS"
       >
         <div
           className="sc-tilXH gVEpTs"
@@ -304,7 +304,7 @@ Generated by [AVA](https://ava.li).
             className="sc-jAaTju jNgXGY sc-bdVaJa bAyxfd"
           >
             <div
-              className="sc-cIShpX dbgqBq sc-bdVaJa iHZvIS"
+              className="sc-cIShpX lbFVsm"
             >
               Content
             </div>