fixed typo and fixed SnapResponse object error, used midtrans instead of veritrans#1

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fendyh wants to merge 3 commits intoadamnoto:masterfrom

Commits on Dec 28, 2017

fixed typo and fixed SnapResponse object error
fendyh
committed

Commits on Jul 11, 2018

fixed readme and typo
fendyh
committed

Commits on Nov 9, 2018

updated to use midtrans.com for API instead of veritrans
fendyh
committed