Update README.md

Adding docker test to the README

... So that we can easily see when we break it

Fixing build

Removing clunky secret

Removing Go 1.12

As golangci-lint doesn't build with it

Removing Go 1.12

As golangci-lint doesn't build with it

Merge PR fclairamb#71: Dealing with file access errors

Fixes issues fclairamb#66, fclairamb#69, fclairamb#70

Merge pull request fclairamb#31 from fclairamb/mlst-support

MLST support

Merge pull request fclairamb#32 from fclairamb/error-on-file-access

Checking if we can write the file *before* opening the transfer connection

Merge pull request fclairamb#17 from fclairamb/travis-setup-releases

Travis setup releases