Bump github.com/mattn/go-colorable from 0.1.7 to 0.1.8 (#312)

Bumps [github.com/mattn/go-colorable](https://github.com/mattn/go-colorable) from 0.1.7 to 0.1.8.
- [Release notes](https://github.com/mattn/go-colorable/releases)
- [Commits](mattn/go-colorable@v0.1.7...v0.1.8)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

go.mod

@@ -20,7 +20,7 @@ require (
 	github.com/ktr0731/grpc-web-go-client v0.2.7
 	github.com/lunixbochs/vtclean v1.0.0 // indirect
 	github.com/manifoldco/promptui v0.8.0
-	github.com/mattn/go-colorable v0.1.7
+	github.com/mattn/go-colorable v0.1.8
 	github.com/mattn/go-isatty v0.0.12
 	github.com/mattn/go-pipeline v0.0.0-20190323144519-32d779b32768 // indirect
 	github.com/mattn/go-runewidth v0.0.8 // indirect

go.sum

@@ -215,6 +215,8 @@ github.com/mattn/go-colorable v0.0.9/go.mod h1:9vuHe8Xs5qXnSaW/c/ABM9alt+Vo+STaO
 github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
 github.com/mattn/go-colorable v0.1.7 h1:bQGKb3vps/j0E9GfJQ03JyhRuxsvdAanXlT9BTw3mdw=
 github.com/mattn/go-colorable v0.1.7/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
+github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNxMWT7Zi4=
 github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=