Update rust buildpack

alexcrichton · alexcrichton · commit b20a35d1a487 · 2015-11-09T16:31:32.000-08:00
diff --git a/.buildpacks b/.buildpacks
@@ -1,4 +1,4 @@
 https://github.com/rcaught/heroku-buildpack-cmake#e4e2c9e
-https://github.com/alexcrichton/heroku-buildpack-rust#2ad8313
+https://github.com/alexcrichton/heroku-buildpack-rust#ca218b5
 https://github.com/tonycoco/heroku-buildpack-ember-cli#426b308
 https://github.com/ryandotsmith/nginx-buildpack.git#af813ba
