README.md: update git URLs (git -> https; gitea)

Change-Id: Ia86979f656557e442b0f432b0646aa7661c293e9
diff --git a/README.md b/README.md
index 9eab71c..e268d23 100644
--- a/README.md
+++ b/README.md
@@ -23,10 +23,10 @@
 
 You can clone from the official Osmocom  git repository using
 ```
-git clone git://git.osmocom.org/pysim.git
+git clone https://gitea.osmocom.org/sim-card/pysim.git
 ```
 
-There is a cgit interface at <https://git.osmocom.org/pysim>
+There is a web interface at <https://gitea.osmocom.org/sim-card/pysim>.
 
 
 Installation