Update list of deps

Thanks to new official releases, we can now use stable packages again.

README.md

@@ -9,8 +9,8 @@ It also contains git submodules so you have to run `git submodule update --init
 
 Install these packages:
 - hcloud-python
-- terraform-git
-- terraform-provider-hcloud-snapshot
+- terraform
+- terraform-provider-hcloud
 
 For the time being, to run all of this you'll need terraform-git and terraform-provider-hcloud-snapshot because of the pg backend.
 This is temporary and the next releases of these packages will contain the modules in a stable version.