Merge rust-bitcoin/corepc#43: Fix typo in crate name in `README.md` #85

Job	Run time
Docs - stable toolchain (recent)	58s
Test - 1.63.0 toolchain (minimal)	2m 26s
Prepare	4s
Integration tests - stable toolchain (28_0)	1m 59s
Test - 1.63.0 toolchain (recent)	2m 34s
Integration tests - stable toolchain (27_1)	1m 52s
Test - stable toolchain (minimal)	42s
Verify - stable toolchain	17s
Integration tests - stable toolchain (27_0)	1m 4s
Test - stable toolchain (recent)	51s
Integration tests - stable toolchain (26_2)	1m 34s
Integration tests - stable toolchain (26_1)	1m 2s
Integration tests - stable toolchain (26_0)	1m 54s
Integration tests - stable toolchain (25_2)	1m 20s
Integration tests - stable toolchain (24_2)	1m 52s
Integration tests - stable toolchain (23_2)	1m 25s
Integration tests - stable toolchain (22_1)	1m 31s
Integration tests - stable toolchain (0_21_2)	1m 26s
Integration tests - stable toolchain (0_20_2)	1m 43s
Integration tests - stable toolchain (0_19_1)	1m 48s
Integration tests - stable toolchain (0_18_1)	1m 16s
Integration tests - stable toolchain (0_17_1)	1m 30s
Format - nightly toolchain	13s
Docs - nightly toolchain (recent)	46s
Test - nightly toolchain (minimal)	50s
Lint - nightly toolchain (recent)	45s
Test - nightly toolchain (recent)	43s
	34m 25s

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