Release 0.3.1

This is release 0.3.1 of ncbi-acc-download.

Main features of this release are:

• support for progress bars (thanks to @444thLiao)
• various bug fixes (thanks @peterjc and @jrjhealey)

Detailed changes:

Joe Healey (1):
      remove unused function and update email

Kai Blin (8):
      core: Change the progress bar shorthand to -P, default to no progress bar
      chore: Use pytest.fixture instead of deprecated pytest.yield_fixture
      core: Don't attempt to download metagenome info from refseq even if group is all
      chore: Ignore more IDE files
      chore: Fix all linter errors reported by flake8
      Makefile: switch linting to flake8 to match CI setup
      chore: Update mailmap
      Bump version number to 0.3.1

Peter Cock (1):
      Fixed typo in command line API help

Tianhua Liao (2):
      add progress bar
      fix repeat bars