Delete io_support/__init__.py

[victorlin]

Description of proposed changes

This file and the parent directory are unused after 0e98435.

Related issue(s)

• Missed this in io: Split io.py into smaller files under new io/ #949

Testing

See checks.

[codecov]

Codecov Report

Merging #984 (01b6d02) into master (c01b314) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #984   +/-   ##
=======================================
  Coverage   59.32%   59.32%           
=======================================
  Files          50       50           
  Lines        6259     6259           
  Branches     1585     1585           
=======================================
  Hits         3713     3713           
  Misses       2285     2285           
  Partials      261      261           

Impacted Files	Coverage Δ
augur/__version__.py	100.00% <100.00%> (ø)

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