Merge rust-bitcoin/corepc#37: Update readme #69

Job	Run time
Prepare	2s
Docs - stable toolchain (recent)	44s
Integration tests - stable toolchain (28_0)	1m 13s
Integration tests - stable toolchain (27_1)	1m 13s
Test - stable toolchain (minimal)	32s
Integration tests - stable toolchain (27_0)	1m 14s
Verify - stable toolchain	11s
Integration tests - stable toolchain (26_2)	57s
Test - stable toolchain (recent)	34s
Test - 1.63.0 toolchain (minimal)	1m 46s
Integration tests - stable toolchain (26_1)	54s
Test - 1.63.0 toolchain (recent)	1m 47s
Integration tests - stable toolchain (26_0)	1m 2s
Integration tests - stable toolchain (25_2)	51s
Integration tests - stable toolchain (24_2)	43s
Integration tests - stable toolchain (23_2)	1m 14s
Integration tests - stable toolchain (22_1)	57s
Integration tests - stable toolchain (0_21_2)	43s
Integration tests - stable toolchain (0_20_2)	1m 7s
Integration tests - stable toolchain (0_19_1)	1m 10s
Integration tests - stable toolchain (0_18_1)	1m 13s
Integration tests - stable toolchain (0_17_1)	1m 6s
Format - nightly toolchain	15s
Lint - nightly toolchain (recent)	38s
Docs - nightly toolchain (recent)	46s
Test - nightly toolchain (minimal)	37s
Test - nightly toolchain (recent)	39s
	24m 8s

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