README.rst: remove git branch from prompt

Sarcasm · Sarcasm · commit 8550f99693aa · 2019-10-20T20:46:58.000+02:00
diff --git a/README.rst b/README.rst
@@ -41,7 +41,7 @@ which also supports comments.
 
 An example configuration is available in this repo::
 
-  $ cat .clang-format-ignore                                                                      (master)*
+  $ cat .clang-format-ignore
   # ignore third_party code from clang-format checks
   src/third_party/*
 
