Adapted sleep function in 'examples/deferred_with_accumulator.cpp' for non-*Nix

[deanmsands3]

Identify the Bug

#156

Description of the Change

Modified deferred_with_accumulator.cpp example
Added thread, chrono headers. Changed sleep() function to C++11

Alternate Designs

#ifdef Windows hack: https://stackoverflow.com/a/10918411/234826

Possible Drawbacks

Might add infinitesimal overhead for Unix systems compared to using straight sleep()

Verification Process

Checked on MinGW64 and Ubuntu x64

Release Notes

Replaced sleep function with C++11 equivalent.

[codecov-io]

Codecov Report

Merging #157 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #157   +/-   ##
======================================
  Coverage    95.3%   95.3%           
======================================
  Files          35      35           
  Lines        3197    3197           
======================================
  Hits         3047    3047           
  Misses        150     150

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[etr]

Thanks for fixing.