Update vendor

vendor/github.com/mattn/go-isatty/isatty_solaris.go

@@ -8,10 +8,9 @@ import (
 )
 
 // IsTerminal returns true if the given file descriptor is a terminal.
-// see: http://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libbc/libc/gen/common/isatty.c
+// see: https://src.illumos.org/source/xref/illumos-gate/usr/src/lib/libc/port/gen/isatty.c
 func IsTerminal(fd uintptr) bool {
-	var termio unix.Termio
-	err := unix.IoctlSetTermio(int(fd), unix.TCGETA, &termio)
+	_, err := unix.IoctlGetTermio(int(fd), unix.TCGETA)
 	return err == nil
 }