Include rust2rpm version info in the generated spec file

Fixes #77.

rust2rpm/__main__.py

@@ -17,7 +17,7 @@ import jinja2
 import requests
 import tqdm
 
-from . import Metadata, licensing
+from . import Metadata, licensing, __version__
 from .metadata import normalize_deps
 
 DEFAULT_EDITOR = "vi"
@@ -265,6 +265,7 @@ def main():
         patch_file = None
 
     kwargs = {}
+    kwargs["generator_version"] = __version__
     kwargs["crate"] = crate
     kwargs["target"] = args.target
     kwargs["all_features"] = args.all_features

rust2rpm/templates/main.spec

@@ -1,5 +1,5 @@
 {% include target ~ "-header.spec.inc" ignore missing %}
-# Generated by rust2rpm
+# Generated by rust2rpm {{ generator_version }}
 %bcond_without check
 {% if not include_main %}
 %global debug_package %{nil}