Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
assert_approx_eq	dev-dependencies	pin	1.1.0 -> =1.1.0
async-std (source)	dev-dependencies	pin	1.5.0 -> =1.5.0
criterion (source)	dev-dependencies	pin	0.3 -> =0.3.6
distance	dev-dependencies	pin	0.4.0 -> =0.4.0
futures (source)	dev-dependencies	pin	0.3 -> =0.3.31
hex	dev-dependencies	pin	0.4 -> =0.4.3
isahc	dev-dependencies	pin	1.7 -> =1.7.2
matches	dev-dependencies	pin	0.1 -> =0.1.10
reqwest	dev-dependencies	pin	0.11.6 -> =0.11.6
termion	dev-dependencies	pin	1.5 -> =1.5.6
tokio (source)	dev-dependencies	pin	1.2 -> =1.47.1

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