Optimization

[chfw]

With your PR, here is a check list:

• [ ] Has test cases written?
• [x] Has all code lines tested?
• [x] Has make format been run?
• [ ] Please update CHANGELOG.yml(not CHANGELOG.rst)
• [x] Passes all Travis CI builds
• [ ] Has fair amount of documentation if your change is complex
• [ ] Agree on NEW BSD License for your contribution

[codecov-io]

Codecov Report

Merging #44 into dev will decrease coverage by 1.32%. The diff coverage is 81.81%.

@@            Coverage Diff             @@
##              dev      #44      +/-   ##
==========================================
- Coverage   96.66%   95.33%   -1.33%     
==========================================
  Files          12       12              
  Lines         629      622       -7     
==========================================
- Hits          608      593      -15     
- Misses         21       29       +8     

Impacted Files	Coverage Δ
pyexcel_xlsx/xlsxr.py	82.35% <76.47%> (-6.91%)	:arrow_down:
pyexcel_xlsx/xlsxw.py	95.23% <100.00%> (-0.60%)	:arrow_down:
tests/test_writer.py	96.96% <100.00%> (-0.18%)	:arrow_down:

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