Add `io` module to collect related submodules

[codecov[bot]]

Codecov Report

Merging #185 into master will decrease coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #185      +/-   ##
==========================================
- Coverage   94.27%   94.27%   -0.01%     
==========================================
  Files          46       46              
  Lines        4964     4962       -2     
==========================================
- Hits         4680     4678       -2     
  Misses        284      284

Impacted Files	Coverage Δ
hyperparameter_hunter/i_o/exceptions.py	88% <ø> (ø)
hyperparameter_hunter/i_o/leaderboards.py	96.66% <ø> (ø)
hyperparameter_hunter/utils/optimization_utils.py	95.23% <100%> (ø)	:arrow_up:
hyperparameter_hunter/experiments.py	92% <100%> (-0.06%)	:arrow_down:
hyperparameter_hunter/i_o/recorders.py	89.1% <100%> (ø)
hyperparameter_hunter/callbacks/bases.py	100% <100%> (ø)	:arrow_up:
hyperparameter_hunter/environment.py	98.79% <100%> (ø)	:arrow_up:
...yperparameter_hunter/optimization/protocol_core.py	97.34% <100%> (ø)	:arrow_up:
hyperparameter_hunter/keys/makers.py	97.02% <100%> (ø)	:arrow_up:
hyperparameter_hunter/utils/version_utils.py	100% <100%> (ø)	:arrow_up:
... and 3 more

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[coveralls]

Pull Request Test Coverage Report for Build 813

• 20 of 20 (100.0%) changed or added relevant lines in 11 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.002%) to 94.277%

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Totals
Change from base Build 809:	-0.002%
Covered Lines:	4678
Relevant Lines:	4962

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💛 - Coveralls