Initialize module and dependencies

vendor/github.com/emersion/go-imap/v2/copy.go

@@ -0,0 +1,9 @@
+package imap
+
+// CopyData is the data returned by a COPY command.
+type CopyData struct {
+	// requires UIDPLUS or IMAP4rev2
+	UIDValidity uint32
+	SourceUIDs  UIDSet
+	DestUIDs    UIDSet
+}