Use edition 2018, reduce unsafe code, replace deprecated uninitialized with MaybeUnit#138

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WildCryptoFox wants to merge 4 commits intopaholg:masterfrom WildCryptoFox:2018-edition

+161-140

Commits on Jan 17, 2020

Use edition 2018, reduce unsafe code, replace deprecated uninitialized with MaybeUnit
James McGlashan
committed
bump minimum rustc version to 1.31
James McGlashan
committed
remove needless fn main from doctest
James McGlashan
committed
bump minimum rustc version to 1.36
James McGlashan
committed