Tests

Merge pull request #200 from LLFourn/fixup-v0.30.0-compat #842

Job	Run time
clippy_check	23s
Rustfmt	11s
doc-build	16s
build	27s
test (x86_64-unknown-linux-gnu)	3m 12s
test-alloc (secp256kfun)	1m 6s
test (armv7-unknown-linux-gnueabihf)	6m 57s
test-alloc (sigma_fun)	2m 29s
test-minimal (secp256kfun)	1m 0s
test-nightly	57s
test-alloc (ecdsa_fun)	41s
test-minimal (sigma_fun)	2m 43s
test-alloc (schnorr_fun)	59s
test-minimal (ecdsa_fun)	43s
test-minimal (schnorr_fun)	45s
	22m 49s

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