Make lru_cache usage in libpq_docs compatible with python 3.7

The "user_function" version (allowing uncalled lru_cache) is only
available since python 3.8.

diff --git a/docs/lib/libpq_docs.py b/docs/lib/libpq_docs.py
index e505e78d4a402489e9e4f4e88b4a0d0fcb0f2645..03830fd402bcd20dd0dac866ba0ed61f0adeb975 100644 (file)
--- a/docs/lib/libpq_docs.py
+++ b/docs/lib/libpq_docs.py
@@ -131,7 +131,7 @@ class LibpqReader:
         return self.app.config.libpq_docs_version
 
 
-@lru_cache
+@lru_cache()
 def get_reader():
     return LibpqReader()