Fixing heading level of stdlib chapter

swaroopch · swaroopch · commit 9894eaa3d418 · 2014-10-16T20:56:45.000+05:30
Thank you Krzysztof Kledzik for bringing this to my attention.
diff --git a/stdlib.asciidoc b/stdlib.asciidoc
@@ -1,5 +1,5 @@
 [[stdlib]]
-=== Standard Library
+== Standard Library
 
 The Python Standard Library contains a huge number of useful modules and is part of every standard
 Python installation. It is important to become familiar with the Python Standard Library since many
