Update reqwest to 0.9.x

[janderholm]

Older reqwest versions depends on an old openssl crate which does not work with openssl 1.1.1.

I believe I have not introduced any new panics.

Fixes #43

[janderholm]

It seems that the tests or the test environment is sketchy. The tests pass every time when I run locally but the linux tests fail on travis. The osx tests seem to work.

[clopnis]

This patch is solving the same issue on my env :+1:

[droundy]

Any chance this is going to be accepted, so something similar?