Add MSRV badge #62

Job	Run time
Build (stable, x86_64-unknown-linux-gnu)	9s
Clippy	17s
Coverage	21s
Build (stable, x86_64-unknown-linux-gnu, --features=defmt-03)	12s
Checks	20s
Build (stable, x86_64-unknown-linux-musl)	11s
Tests (stable, x86_64-unknown-linux-gnu)	16s
Build (stable, x86_64-unknown-linux-musl, --features=defmt-03)	17s
Tests (stable, x86_64-unknown-linux-musl)	13s
Build (stable, arm-unknown-linux-gnueabi)	7s
Tests (beta, x86_64-unknown-linux-gnu)	18s
Build (stable, arm-unknown-linux-gnueabi, --features=defmt-03)	15s
Tests (beta, x86_64-unknown-linux-musl)	18s
Build (stable, armv7-unknown-linux-gnueabihf)	10s
Build (stable, armv7-unknown-linux-gnueabihf, --features=defmt-03)	14s
Build (stable, thumbv6m-none-eabi)	14s
Build (stable, thumbv6m-none-eabi, --features=defmt-03)	16s
Build (stable, thumbv7em-none-eabi)	19s
Build (stable, thumbv7em-none-eabi, --features=defmt-03)	14s
Build (stable, thumbv7em-none-eabihf)	9s
Build (stable, thumbv7em-none-eabihf, --features=defmt-03)	15s
Build (stable, thumbv7m-none-eabi)	11s
Build (stable, thumbv7m-none-eabi, --features=defmt-03)	13s
Build (1.62.0, x86_64-unknown-linux-gnu)	1m 27s
Build (1.62.0, x86_64-unknown-linux-musl)	1m 36s
Build (1.62.0, arm-unknown-linux-gnueabi)	1m 28s
Build (1.62.0, armv7-unknown-linux-gnueabihf)	1m 46s
Build (1.62.0, thumbv6m-none-eabi)	1m 37s
Build (1.62.0, thumbv7em-none-eabi)	1m 27s
Build (1.62.0, thumbv7em-none-eabihf)	1m 30s
Build (1.62.0, thumbv7m-none-eabi)	1m 33s
	17m 53s

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