Remove no-longer-used README.version.

Test: builds
Change-Id: I856eb865b3805e46f5c722bc105f0aa1fe25442f
diff --git a/README.version b/README.version
deleted file mode 100644
index a606a14..0000000
--- a/README.version
+++ /dev/null
@@ -1,2 +0,0 @@
-URL: http://swtch.com/plan9port/unix/libutf.tgz
-Version: 2.0