Replace Travis link with Github Actions link #707

Job	Run time
Rustfmt	10s
Test (aarch64-unknown-linux-gnu, ubuntu-latest, nightly)	2m 6s
Clippy	17s
Test (arm-unknown-linux-gnueabi, ubuntu-latest, nightly)	1m 50s
Test (arm-unknown-linux-gnueabihf, ubuntu-latest, nightly)	1m 50s
Test (i586-unknown-linux-gnu, ubuntu-latest, nightly)	1m 35s
Test (i686-unknown-linux-gnu, ubuntu-latest, nightly)	1m 29s
Test (powerpc-unknown-linux-gnu, ubuntu-latest, nightly)	1m 56s
Test (powerpc64-unknown-linux-gnu, ubuntu-latest, nightly)	1m 49s
Test (powerpc64le-unknown-linux-gnu, ubuntu-latest, nightly)	2m 4s
Test (thumbv6m-none-eabi, ubuntu-latest, nightly)	1m 24s
Test (thumbv7em-none-eabi, ubuntu-latest, nightly)	1m 21s
Test (thumbv7em-none-eabihf, ubuntu-latest, nightly)	1m 18s
Test (thumbv7m-none-eabi, ubuntu-latest, nightly)	1m 38s
Test (wasm32-unknown-unknown, ubuntu-latest, nightly)	1m 24s
Test (x86_64-unknown-linux-gnu, ubuntu-latest, nightly)	1m 28s
Test (x86_64-apple-darwin, macos-latest, nightly)	2m 4s
Test (i686-pc-windows-msvc, windows-latest, nightly)	2m 16s
Test (x86_64-pc-windows-msvc, windows-latest, nightly)	1m 58s
Test (i686-pc-windows-gnu, windows-latest, nightly-i686-gnu)	2m 22s
Test (x86_64-pc-windows-gnu, windows-latest, nightly-x86_64-gnu)	2m 36s
	34m 55s

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