update README.md

Author: Yao Yue

README.md

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 # Twemcache: Twitter Memcached [![Build Status](https://secure.travis-ci.org/twitter/twemcache.png)](http://travis-ci.org/twitter/twemcache)
 
-Twemcache (pronounced "two-em-cache") is the Twitter Memcached. Twemcache is based on a fork of [Memcached](http://memcached.org/) v.1.4.4 that has been heavily modified to make to suitable for the large scale production environment at Twitter.
+Twemcache (pronounced "tw-em-cache") is the Twitter Memcached. Twemcache is based on a fork of [Memcached](http://memcached.org/) v.1.4.4 that has been heavily modified to make to suitable for the large scale production environment at Twitter.
 
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