Backslash inside inline code breaks highlighting

[coffeejunk]

A backslash in front of a (single) closing tick of inline code breaks the highlighting for the rest of the file.

`\`   => breaks
` \`  => breaks
` \ ` => ok
`\ `  => ok

``\``  => ok
`` \`` => ok
``\ `` => ok

`` `\` ``   => ok
`` ` \` ``  => ok
`` `\ ` ``  => ok
`` ` \ ` `` => ok

[cirosantilli]

Confirmed as per; http://spec.commonmark.org/0.18/#example-259