add SetBoundary(boundary string) method#109

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vodolaz095 wants to merge 2 commits intogo-gomail:masterfrom vodolaz095:master

+52-4

Commits on Feb 11, 2018

add SetBoundary(boundary string) method to manually set mime boundary sting
vodolaz095
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Commits on Feb 15, 2018

simplify code
vodolaz095
committed