file: support multiline comments

file.go

@@ -305,6 +305,10 @@ func (f *File) writeToBuffer(indent string) (*bytes.Buffer, error) {
 				} else {
 					key.Comment = key.Comment[:1] + " " + strings.TrimSpace(key.Comment[1:])
 				}
+
+				// Support multiline comments
+				key.Comment = strings.Replace(key.Comment, "\n", "\n; ", -1)
+
 				if _, err := buf.WriteString(key.Comment + LineBreak); err != nil {
 					return nil, err
 				}

file_test.go

@@ -264,6 +264,22 @@ func TestFile_WriteTo(t *testing.T) {
 		So(err, ShouldBeNil)
 		So(buf.String(), ShouldEqual, string(expected))
 	})
+
+	Convey("Support multiline comments", t, func() {
+		f := ini.Empty()
+		f.Section("").Key("test").Comment = "Multiline\nComment"
+
+		var buf bytes.Buffer
+		_, err := f.WriteTo(&buf)
+		So(err, ShouldBeNil)
+
+		So(buf.String(), ShouldEqual, `; Multiline
+; Comment
+test = 
+
+`)
+
+	})
 }
 
 func TestFile_SaveTo(t *testing.T) {

ini.go

@@ -32,7 +32,7 @@ const (
 
 	// Maximum allowed depth when recursively substituing variable names.
 	_DEPTH_VALUES = 99
-	_VERSION      = "1.33.0"
+	_VERSION      = "1.34.0"
 )
 
 // Version returns current package version literal.