add Hare comment style

Author: vladh

src/reuse/_comment.py

@@ -513,8 +513,9 @@ class VimCommentStyle(CommentStyle):
     ".graphql": PythonCommentStyle,
     ".groovy": CCommentStyle,
     ".h": CCommentStyle,
-    ".hh": CCommentStyle,
+    ".ha": CCommentStyle,
     ".hbs": HandlebarsCommentStyle,
+    ".hh": CCommentStyle,
     ".hpp": CCommentStyle,
     ".hrl": TexCommentStyle,
     ".hs": HaskellCommentStyle,