- restored Name section that got messed up by spec-cleaner

- specfile:
* remove devel for noarch
* remove restriction for urllib3 < 1.24
* HISTORY and README changed from .rst to .md
- update to version 2.20.0:
* Bugfixes
+ Content-Type header parsing is now case-insensitive
(e.g. charset=utf8 v Charset=utf8).
+ Fixed exception leak where certain redirect urls would raise
uncaught urllib3 exceptions.
+ Requests removes Authorization header from requests redirected
from https to http on the same hostname. (CVE-2018-18074)
+ should_bypass_proxies now handles URIs without hostnames
(e.g. files).
* Dependencies
+ Requests now supports urllib3 v1.24.
* Deprecations
+ Requests has officially stopped support for Python 2.6.