[doc] fix rst format to be able to upload the package to pypi

README.rst

@@ -18,17 +18,17 @@ Installation
 ~~~~~~~~~~~~
 
 With Docker
-------
+-----------
 Go to the `searx-docker <https://github.com/searx/searx-docker>`__ project.
 
 Without Docker
-------
+--------------
 For all of the details, follow this `step by step installation <https://asciimoo.github.io/searx/dev/install/installation.html>`__.
 
 Note: the documentation needs to be updated.
 
 If you are in a hurry
-------
+---------------------
 -  clone the source:
    ``git clone https://github.com/asciimoo/searx.git && cd searx``
 -  install dependencies: ``./manage.sh update_packages``