docs: added sqlite dependency to docs (invenio-db)
docs: added sqlite dependency to docs (invenio-db)

Signed-off-by: Krzysztof Nowak <ec2e6b092344a8f9a548dde0d2ede1e06ecfeabd@cern.ch>

inveniosoftware/invenio-oauth2server,tiborsimko/invenio-oauth2server,tiborsimko/invenio-oauth2server,inveniosoftware/invenio-oauth2server,inveniosoftware/invenio-oauth2server,tiborsimko/invenio-oauth2server