Remove version from the extensions resource URLs.
diff --git a/openstack/common/extensions/urls.go b/openstack/common/extensions/urls.go
index e31e76c..2d9a563 100644
--- a/openstack/common/extensions/urls.go
+++ b/openstack/common/extensions/urls.go
@@ -2,12 +2,10 @@
 
 import "github.com/rackspace/gophercloud"
 
-const version = "v2.0"
-
 func extensionURL(c *gophercloud.ServiceClient, name string) string {
-	return c.ServiceURL(version, "extensions", name)
+	return c.ServiceURL("extensions", name)
 }
 
 func listExtensionURL(c *gophercloud.ServiceClient) string {
-	return c.ServiceURL(version, "extensions")
+	return c.ServiceURL("extensions")
 }