[Chore] Use a fixed version of spdy-transport

**What?**

Point to the fixed version of spdy-transport from spdy-http2/spdy-transport#61.

**Why?**

Because ths breaks use of webpack-dev-server and we're
aren't sure when the PRs will be merged.

package.json

@@ -39,7 +39,7 @@
     "http-deceiver": "^1.2.7",
     "safe-buffer": "^5.0.1",
     "select-hose": "^2.0.0",
-    "spdy-transport": "^2.0.18"
+    "spdy-transport": "jacobheun/spdy-transport#chore/update-deps"
   },
   "devDependencies": {
     "istanbul": "^0.4.5",