Added proper USB connection closing function.#3

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MartinRobomaze wants to merge 2 commits intoEmbedME:masterfrom

MartinRobomaze:master

Commits on Sep 10, 2019

Added proper close function
MartinRobomaze
committed

Commits on Nov 7, 2019

Added, tested and modified examples to use proper USB communication closing function
MartinRobomaze
committed