Revert "Add note about broken openweathermap cert-chain to readme.md"

This reverts commit daee3c2a9a.

README.md

@@ -1,9 +1,3 @@
-# Since May, 30 2020 openweathermap.org somehow messed up their certification chain.
-# You can not load data with the extension.
-# Please try the workaround in #272.
-
-
-
 ![Screenshot](https://gitlab.com/jenslody/gnome-shell-extension-openweather/raw/master/data/Screenshot.jpg)
 
 *gnome-shell-extension-openweather* is a simple extension for displaying weather conditions and forecasts in GNOME Shell, featuring support for multiple locations, no need for WOEID, a symmetrical layout and a settings panel through *gnome-shell-extension-prefs*.
@@ -102,7 +96,7 @@ Copyright © 2011 - 2013
 * Christian Metzler <neroth@xeked.com>,
 * Jens Lody <jens@jenslody.de>.
 
-Copyright &copy; 2013 - 2020
+Copyright &copy; 2013 - 2017
 * Jens Lody <openweather@jenslody.de>.
 
 Copyright &copy; 2018