remove mention of _db as it doesn't exist.
remove mention of _db as it doesn't exist.

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