chore: migrate to go modules

vendor/github.com/containous/go-bindata/go-bindata/AppendSliceValue.go

@@ -0,0 +1,22 @@
+package main
+
+import "strings"
+
+// borrowed from https://github.com/hashicorp/serf/blob/master/command/agent/flag_slice_value.go
+
+// AppendSliceValue implements the flag.Value interface and allows multiple
+// calls to the same variable to append a list.
+type AppendSliceValue []string
+
+func (s *AppendSliceValue) String() string {
+	return strings.Join(*s, ",")
+}
+
+func (s *AppendSliceValue) Set(value string) error {
+	if *s == nil {
+		*s = make([]string, 0, 1)
+	}
+
+	*s = append(*s, value)
+	return nil
+}