add note about brew recipe.
add note about brew recipe.

eHealthAfrica/couchdb-lucene,eHealthAfrica/couchdb-lucene,rnewson/couchdb-lucene,rnewson/couchdb-lucene,ehealthafrica-ci/couchdb-lucene,ehealthafrica-ci/couchdb-lucene,eHealthAfrica/couchdb-lucene,ehealthafrica-ci/couchdb-lucene,rnewson/couchdb-lucene