Fix the CI badge in `README.md` (#67) #144

Job	Run time
clippy-xtensa (esp32, xtensa-esp32-none-elf)	1m 40s
clippy-xtensa (esp32s2, xtensa-esp32s2-none-elf)	1m 33s
check-xtensa (esp32, xtensa-esp32-none-elf)	1m 46s
clippy-xtensa (esp32s3, xtensa-esp32s3-none-elf)	1m 42s
clippy-riscv (esp32c2, riscv32imc-unknown-none-elf)	15s
check-xtensa (esp32s2, xtensa-esp32s2-none-elf)	1m 33s
clippy-riscv (esp32c3, riscv32imc-unknown-none-elf)	18s
check-xtensa (esp32s3, xtensa-esp32s3-none-elf)	1m 41s
clippy-riscv (esp32c6, riscv32imac-unknown-none-elf)	24s
check-riscv (esp32c2, riscv32imc-unknown-none-elf)	25s
check-riscv (esp32c3, riscv32imc-unknown-none-elf)	24s
clippy-riscv (esp32h2, riscv32imac-unknown-none-elf)	22s
msrv-riscv (esp32c2, riscv32imc-unknown-none-elf)	32s
check-riscv (esp32c6, riscv32imac-unknown-none-elf)	33s
msrv-riscv (esp32c3, riscv32imc-unknown-none-elf)	31s
msrv-riscv (esp32c6, riscv32imac-unknown-none-elf)	36s
msrv-xtensa (esp32, xtensa-esp32-none-elf)	1m 37s
check-riscv (esp32h2, riscv32imac-unknown-none-elf)	39s
msrv-xtensa (esp32s2, xtensa-esp32s2-none-elf)	1m 49s
msrv-riscv (esp32h2, riscv32imac-unknown-none-elf)	32s
msrv-xtensa (esp32s3, xtensa-esp32s3-none-elf)	1m 36s
rustfmt	14s
	20m 42s

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