chore(package): update can-route-pushstate to version 6.0.0

Closes #685

Author: greenkeeper[bot]

package.json

@@ -37,7 +37,7 @@
     "can-fixture": "^2.0.0",
     "can-globals": "<2.0.0",
     "can-route": "^4.0.0",
-    "can-route-pushstate": "^4.0.0",
+    "can-route-pushstate": "^6.0.0",
     "can-stache": "^4.0.0",
     "copy-dir": "0.0.8",
     "documentjs": "^0.5.0",