Fix integer overflow issue #8

Job	Run time
Publish to Github Releases (aarch64-unknown-linux-musl, ubuntu-latest, true)	6m 12s
Publish to Github Releases (aarch64-apple-darwin, macos-latest, true)	8m 23s
Publish to Github Releases (aarch64-pc-windows-msvc, windows-latest, true, --no-default-features)	10m 47s
Publish to Github Releases (x86_64-apple-darwin, macos-latest)	6m 26s
Publish to Github Releases (x86_64-pc-windows-msvc, windows-latest)	8m 14s
Publish to Github Releases (x86_64-unknown-linux-musl, ubuntu-latest, true)	7m 50s
Publish to Github Releases (i686-unknown-linux-musl, ubuntu-latest, true)	6m 10s
Publish to Github Releases (i686-pc-windows-msvc, windows-latest, true)	10m 22s
Publish to Github Releases (armv7-unknown-linux-musleabihf, ubuntu-latest, true)	7m 53s
Publish to Github Releases (arm-unknown-linux-musleabihf, ubuntu-latest, true)	7m 21s
Publish to Github Releases (mips-unknown-linux-musl, ubuntu-latest, true, --no-default-features)	6m 3s
Publish to Github Releases (mipsel-unknown-linux-musl, ubuntu-latest, true, --no-default-features)	7m 21s
Publish to Github Releases (mips64-unknown-linux-gnuabi64, ubuntu-latest, true, --no-default-feat...	5m 50s
Publish to Github Releases (mips64el-unknown-linux-gnuabi64, ubuntu-latest, true, --no-default-fe...	8m 1s
	1h 46m 53s

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