Bump credo from 1.7.8 to 1.7.9 #76

Job	Run time
NIF 2.16 - arm-unknown-linux-gnueabihf (ubuntu-20.04)	1m 37s
NIF 2.16 - aarch64-unknown-linux-gnu (ubuntu-20.04)	1m 34s
NIF 2.16 - aarch64-unknown-linux-musl (ubuntu-20.04)	1m 38s
NIF 2.16 - aarch64-apple-darwin (macos-latest)	1m 14s
NIF 2.16 - riscv64gc-unknown-linux-gnu (ubuntu-20.04)	1m 24s
NIF 2.16 - x86_64-apple-darwin (macos-latest)	1m 26s
NIF 2.16 - x86_64-unknown-linux-gnu (ubuntu-20.04)	1m 8s
NIF 2.16 - x86_64-unknown-linux-musl (ubuntu-20.04)	1m 39s
NIF 2.16 - x86_64-pc-windows-gnu (windows-2019)	2m 38s
NIF 2.16 - x86_64-pc-windows-msvc (windows-2019)	2m 27s
NIF 2.15 - arm-unknown-linux-gnueabihf (ubuntu-20.04)	1m 37s
NIF 2.15 - aarch64-unknown-linux-gnu (ubuntu-20.04)	1m 35s
NIF 2.15 - aarch64-unknown-linux-musl (ubuntu-20.04)	1m 39s
NIF 2.15 - aarch64-apple-darwin (macos-latest)	1m 22s
NIF 2.15 - riscv64gc-unknown-linux-gnu (ubuntu-20.04)	1m 30s
NIF 2.15 - x86_64-apple-darwin (macos-latest)	1m 25s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04)	1m 8s
NIF 2.15 - x86_64-unknown-linux-musl (ubuntu-20.04)	1m 42s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2019)	3m 12s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019)	2m 49s
	34m 44s

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