u_boot_pylib: Correct readme formatting
Correct a heading which is too short in the readme.
Fixes: 75554dfac29 ("patman: Add support for building a u_boot_tools...")
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/u_boot_pylib/README.rst b/tools/u_boot_pylib/README.rst
index 93858f5..36a1825 100644
--- a/tools/u_boot_pylib/README.rst
+++ b/tools/u_boot_pylib/README.rst
@@ -1,7 +1,7 @@
.. SPDX-License-Identifier: GPL-2.0+
# U-Boot Python Library
-=====================
+=======================
This is a Python library used by various U-Boot tools, including patman,
buildman and binman.