Support for Windows server 2012 R2

[g-prasanth]

Adding support for Windows Server 2012 R2

[svishwanath-tw]

Hi @g-prasanth . Thanks for the PR. The fix looks simple enough.
I have 2 Questions before we proceed:

1. have you tested that talisman install on windows 2012 with these changes
2. Can we get away with MINGW64_NT-* instead of having to separate match clauses in installation ?

[g-prasanth]

Hi @svishwanath-tw . Yes! I've tested the changes in Windows 2012 R2. I don't have enough setup to test the MINGW64_NT-* case.

[codecov]

Codecov Report

Merging #305 (7f8353a) into master (95ae738) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   69.74%   69.74%           
=======================================
  Files          27       27           
  Lines        1094     1094           
=======================================
  Hits          763      763           
  Misses        298      298           
  Partials       33       33           

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