added vendor/

vendor/github.com/sirupsen/logrus/terminal_check_unix.go

@@ -0,0 +1,13 @@
+// +build linux aix zos
+// +build !js
+
+package logrus
+
+import "golang.org/x/sys/unix"
+
+const ioctlReadTermios = unix.TCGETS
+
+func isTerminal(fd int) bool {
+	_, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
+	return err == nil
+}