fix keras installation (Closes brazil-data-cube#29)

Merge pull request brazil-data-cube#27 from M3nin0/master

Update to SITS 0.16.1

Merge pull request brazil-data-cube#25 from M3nin0/master

Update repository description

Merge pull request brazil-data-cube#26 from M3nin0/master

SITS 0.16.0-1