Delete unused requirements file

[rahulporuri]

This PR removes an unused requirements file.

[kitchoi]

LGTM

[codecov-io]

Codecov Report

Merging #817 (4396651) into master (0d1516e) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #817      +/-   ##
==========================================
+ Coverage   40.81%   40.89%   +0.07%     
==========================================
  Files         508      508              
  Lines       27845    27847       +2     
  Branches     4219     4219              
==========================================
+ Hits        11366    11388      +22     
+ Misses      15999    15986      -13     
+ Partials      480      473       -7     

Impacted Files	Coverage Δ
pyface/ui/wx/tree/tree.py	0.00% <ø> (ø)
pyface/i_widget.py	100.00% <100.00%> (ø)
pyface/ui/qt4/console/console_widget.py	29.28% <0.00%> (+0.20%)	⬆️
pyface/ui/qt4/code_editor/code_widget.py	43.97% <0.00%> (+0.42%)	⬆️
pyface/wx/python_stc.py	10.36% <0.00%> (+1.21%)	⬆️
pyface/ui/wx/window.py	77.10% <0.00%> (+2.40%)	⬆️
pyface/ui/qt4/util/gui_test_assistant.py	80.53% <0.00%> (+2.65%)	⬆️
pyface/ui/wx/data_view/data_view_widget.py	77.52% <0.00%> (+5.61%)	⬆️
pyface/__init__.py	88.88% <0.00%> (+7.40%)	⬆️
pyface/i_file_dialog.py	84.61% <0.00%> (+7.69%)	⬆️

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