add vendoring

vendor/github.com/jhillyerd/enmime/options.go

@@ -0,0 +1,29 @@
+package enmime
+
+// Option to configure parsing.
+type Option interface {
+	apply(p *Parser)
+}
+
+// SkipMalformedParts sets parsing to skip parts that's can't be parsed.
+func SkipMalformedParts(s bool) Option {
+	return skipMalformedPartsOption(s)
+}
+
+type skipMalformedPartsOption bool
+
+func (o skipMalformedPartsOption) apply(p *Parser) {
+	p.skipMalformedParts = bool(o)
+}
+
+// MultipartWOBoundaryAsSinglePart if set to true will treat a multi-part messages without boundary parameter as single-part.
+// Otherwise, will return error that boundary is not found.
+func MultipartWOBoundaryAsSinglePart(a bool) Option {
+	return multipartWOBoundaryAsSinglePartOption(a)
+}
+
+type multipartWOBoundaryAsSinglePartOption bool
+
+func (o multipartWOBoundaryAsSinglePartOption) apply(p *Parser) {
+	p.multipartWOBoundaryAsSinglePart = bool(o)
+}