Migrate to csproj 2017

[304NotModified]

related #39

[codecov-io]

Codecov Report

Merging #40 into master will increase coverage by 1.69%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
+ Coverage   66.52%   68.21%   +1.69%     
==========================================
  Files           7        7              
  Lines         457      516      +59     
  Branches       93       94       +1     
==========================================
+ Hits          304      352      +48     
- Misses        111      123      +12     
+ Partials       42       41       -1

Impacted Files	Coverage Δ
...og.Windows.Forms/RichTextBoxLinkLayoutRenderer .cs	88.46% <0%> (-2.02%)	⬇️
NLog.Windows.Forms/MessageBoxTarget.cs	0% <0%> (ø)	⬆️
NLog.Windows.Forms/FormControlTarget.cs	0% <0%> (ø)	⬆️
NLog.Windows.Forms/RichTextBoxRowColoringRule.cs	100% <0%> (ø)	⬆️
NLog.Windows.Forms/FormHelper.cs	79.68% <0%> (+0.32%)	⬆️
NLog.Windows.Forms/RichTextBoxTarget.cs	76.28% <0%> (+2.44%)	⬆️
NLog.Windows.Forms/RichTextBoxWordColoringRule.cs	54.54% <0%> (+12.23%)	⬆️

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