gomarkdown quoted fenced code block bug

bug.md

Bug demo:

quoted block 1 start

fenced pre block 1

quoted block 1 end

Paragraph

fenced pre block 2

quoted block 2 start

fenced pre block 3

quoted block 2 end

go.mod

module bug-demo

go 1.12

require github.com/gomarkdown/markdown v0.0.0-20190802011031-b3dd8ce84a34

go.sum

github.com/gomarkdown/markdown v0.0.0-20190802011031-b3dd8ce84a34 h1:ReCH/CAy9I/3I5kTaIi68r8Fcf50MEs//X1y9S29KMU=
github.com/gomarkdown/markdown v0.0.0-20190802011031-b3dd8ce84a34/go.mod h1:JDGcbDT52eL4fju3sZ4TeHGsQwhG9nbDV21aMyhwPoA=

main.go

package main

import (
	"io/ioutil"
	"os"

	"github.com/gomarkdown/markdown"
)

func main() {
	if err := run(); err != nil {
		os.Stderr.WriteString(err.Error() + "\n")
		os.Exit(1)
	}
}

func run() error {
	md, err := ioutil.ReadFile("bug.md")
	if err != nil {
		return err
	}
	_, err = os.Stdout.Write(markdown.ToHTML(md, nil, nil))
	return err
}