Update README.md

Remove "windows" from the text before it is not supported currently.

README.md

diff --git a/README.md b/README.md
index f56f86b..483e3bb 100644
--- a/README.md
+++ b/README.md
@@ -179,7 +179,7 @@
     adb logcat | ./tools/android_stack_parser/stack
     ```
 
-### On Linux and Windows
+### On Linux
 
 1. Build the mojo target, which builds the shell and all examples:
     ```