Fix syntax issue.
diff --git a/README.rst b/README.rst
index c81814b..7702149 100644
--- a/README.rst
+++ b/README.rst
@@ -59,7 +59,7 @@
 Documentation can be found at <https://libcloud.readthedocs.org>.
 
 Note on Python Version Compatibility
-===================================
+====================================
 
 Libcloud v3.0.0 dropped support for Python 2.7 and Python 3.4 and now only
 supports Python >= 3.5.