google manager should be loaded async

Author: rsokl

Python/conf.py

@@ -101,7 +101,8 @@
 
 def setup(app):
     app.add_css_file("my_theme.css")
-    app.add_js_file("https://www.googletagmanager.com/gtag/js?id=UA-115029372-1")
+    app.add_js_file(
+        "https://www.googletagmanager.com/gtag/js?id=UA-115029372-1", loading_method="async")
     app.add_js_file("gtag.js")
 
 
@@ -168,7 +169,8 @@ def setup(app):
 # One entry per manual page. List of tuples
 # (source start file, name, description, authors, manual section).
 man_pages = [
-    (master_doc, "bfundamentalsofpython", "BPython Like You Mean It", [author], 1)
+    (master_doc, "bfundamentalsofpython",
+     "BPython Like You Mean It", [author], 1)
 ]