refactor(misc): fix a handful of TODO

internal/reader/opml/opml.go

@@ -16,11 +16,6 @@ type opmlDocument struct {
 	Outlines opmlOutlineCollection `xml:"body>outline"`
 }
 
-// TODO remove as this is only used in the opml package
-func NewOPMLDocument() *opmlDocument {
-	return &opmlDocument{}
-}
-
 type opmlHeader struct {
 	Title       string `xml:"title,omitempty"`
 	DateCreated string `xml:"dateCreated,omitempty"`

internal/reader/opml/parser.go

@@ -13,7 +13,7 @@ import (
 
 // parse reads an OPML file and returns a SubcriptionList.
 func parse(data io.Reader) (subcriptionList, error) {
-	opmlDocument := NewOPMLDocument()
+	opmlDocument := &opmlDocument{}
 	decoder := xml.NewDecoder(data)
 	decoder.Entity = xml.HTMLEntity
 	decoder.Strict = false

internal/reader/opml/serializer.go

@@ -32,7 +32,7 @@ func serialize(subscriptions subcriptionList) string {
 }
 
 func convertSubscriptionsToOPML(subscriptions subcriptionList) *opmlDocument {
-	opmlDocument := NewOPMLDocument()
+	opmlDocument := &opmlDocument{}
 	opmlDocument.Version = "2.0"
 	opmlDocument.Header.Title = "Miniflux"
 	opmlDocument.Header.DateCreated = time.Now().Format("Mon, 02 Jan 2006 15:04:05 MST")