Update vendor

vendor/github.com/theupdateframework/notary/const_nowindows.go

@@ -0,0 +1,16 @@
+// +build !windows
+
+package notary
+
+import (
+	"os"
+	"syscall"
+)
+
+// NotarySupportedSignals contains the signals we would like to capture:
+// - SIGUSR1, indicates a increment of the log level.
+// - SIGUSR2, indicates a decrement of the log level.
+var NotarySupportedSignals = []os.Signal{
+	syscall.SIGUSR1,
+	syscall.SIGUSR2,
+}