Tests

Merge pull request #198 from LLFourn/fix-clippy #832

Job	Run time
build	1m 47s
Rustfmt	11s
clippy_check	34s
doc-build	20s
test (x86_64-unknown-linux-gnu)	3m 53s
test-alloc (secp256kfun)	1m 1s
test (armv7-unknown-linux-gnueabihf)	7m 19s
test-minimal (secp256kfun)	1m 1s
test-alloc (sigma_fun)	2m 51s
test-nightly	1m 32s
test-minimal (sigma_fun)	2m 40s
test-alloc (ecdsa_fun)	42s
test-minimal (ecdsa_fun)	40s
test-alloc (schnorr_fun)	1m 1s
test-minimal (schnorr_fun)	50s
	26m 22s

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