Update vendor (#852)

vendor/github.com/mattn/go-colorable/go.mod

@@ -1,3 +1,3 @@
 module github.com/mattn/go-colorable
 
-require github.com/mattn/go-isatty v0.0.5
+require github.com/mattn/go-isatty v0.0.8

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

@@ -0,0 +1,23 @@
+// +build android
+
+package isatty
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const ioctlReadTermios = syscall.TCGETS
+
+// IsTerminal return true if the file descriptor is terminal.
+func IsTerminal(fd uintptr) bool {
+	var termios syscall.Termios
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return err == 0
+}
+
+// IsCygwinTerminal return true if the file descriptor is a cygwin or msys2
+// terminal. This is also always false on this environment.
+func IsCygwinTerminal(fd uintptr) bool {
+	return false
+}

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

@@ -1,4 +1,4 @@
-// +build appengine js
+// +build appengine js nacl
 
 package isatty
 

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

@@ -1,5 +1,6 @@
-// +build linux
+// +build linux aix
 // +build !appengine
+// +build !android
 
 package isatty