Updating README to reflect child context fix.
Updating README to reflect child context fix.

bobthecow/mustache.php,cgvarela/mustache.php,BrunoDeBarros/mustache.php,irontec/mustache,sophatvathana/mustache.php,zuluf/mustache.php,thecocce/mustache.php,evdevgit/mustache.php,daffl/zfmustache,ericariyanto/mustache.php