restructured the project to comply community guideline, for others check release note

internal/proxy/fields/signal.go

@@ -0,0 +1,17 @@
+package fields
+
+import (
+	E "github.com/yusing/go-proxy/internal/error"
+)
+
+type Signal string
+
+func ValidateSignal(s string) (Signal, E.NestedError) {
+	switch s {
+	case "", "SIGINT", "SIGTERM", "SIGHUP", "SIGQUIT",
+		"INT", "TERM", "HUP", "QUIT":
+		return Signal(s), nil
+	}
+
+	return "", E.Invalid("signal", s)
+}