build: Bump rand and flate2#1923

Merged

kinnison merged 2 commits intorust-lang:masterfrom tesuji:rand-up

Jul 2, 2019

+172-95

Commits on Jun 30, 2019

build: Bump rand to 0.7
tesuji
committed

Commits on Jul 1, 2019

build: Bump other deps
tesuji
committed