Update what's new

Fix previous commit

Merge pull request HKU-BAL#16 from HKU-BAL/develop

update README

Merge pull request HKU-BAL#10 from HKU-BAL/develop

Uppercase sequences

Merge branch 'develop'

Update avaiable_slots and prediction batch size

- prevent using too much memory

Update IUPAC stuff

- temporary disable non-ACGTU base variant call

Update README.md

Merge branch 'feature/readme_update' into develop

Suppress deprecation warnings on tensorflow