Updated Ruby README.

Change-Id: I8c3717f549c9b4e9d07c77ec5875c9cd62b296ac
zphilip · Feb 21, 2015 · 6ad8f54 · 6ad8f54
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diff --git a/ruby/README.md b/ruby/README.md
@@ -16,7 +16,6 @@ To build this Ruby extension, you will need:
 * Bundler
 * Ruby development headers
 * a C compiler
-* the upb submodule
 
 First, install the required Ruby gems: