Fix avoiding p-in-p when existing p has attribute

[danielfdickinson]

When a Markdown block has an attribute:

Sample paragraph. It's really short {.p-first}

we can't just search for \

because it will be a \

. We can, however, search for the closing tag \

instead and this resolves the issue.

Closes #129

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[danielfdickinson]

Glad I could help. Hope you don't mind all my writing yesterday!