Add affiliate code#204

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JacobPlaster wants to merge 4 commits intobitfinexcom:masterfrom

JacobPlaster:add-affiliate-code

Commits on Dec 4, 2019

types: Add ability to specify meta and affiliate code in order
JacobPlaster
committed
bump to 2.2.6
JacobPlaster
committed
types.Order: pass through meta
JacobPlaster
committed
fix unit tests
JacobPlaster
committed