update vendor directory

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

@@ -0,0 +1,35 @@
+// +build windows
+
+package isatty
+
+import (
+	"testing"
+)
+
+func TestCygwinPipeName(t *testing.T) {
+	tests := []struct {
+		name   string
+		result bool
+	}{
+		{``, false},
+		{`\msys-`, false},
+		{`\cygwin-----`, false},
+		{`\msys-x-PTY5-pty1-from-master`, false},
+		{`\cygwin-x-PTY5-from-master`, false},
+		{`\cygwin-x-pty2-from-toaster`, false},
+		{`\cygwin--pty2-from-master`, false},
+		{`\\cygwin-x-pty2-from-master`, false},
+		{`\cygwin-x-pty2-from-master-`, true}, // for the feature
+		{`\cygwin-e022582115c10879-pty4-from-master`, true},
+		{`\msys-e022582115c10879-pty4-to-master`, true},
+		{`\cygwin-e022582115c10879-pty4-to-master`, true},
+	}
+
+	for _, test := range tests {
+		want := test.result
+		got := isCygwinPipeName(test.name)
+		if want != got {
+			t.Fatalf("isatty(%q): got %v, want %v:", test.name, got, want)
+		}
+	}
+}