Build failure on FreeBSD
This may be related to #228, as I got the same error when trying to build a package that uses nimterop.

## Steps to reproduce:

1. Use FreeBSD (perhaps not required, but that's the platform I am on)
2. `git clone https://github.com/nimterop/nimterop.git`
3. `cd nimterop`
4. `nim c nimterop/toast`

## Nim version

Built from nim-lang/Nim#HEAD.

```
> nim -v
Nim Compiler Version 1.3.5 [FreeBSD: amd64]
Compiled at 2020-06-18
Copyright (c) 2006-2020 by Andreas Rumpf

git hash: bb62feff72a911ca9a314eba6409a6f4f786b568
active boot switches: -d:release
```

## Error:

See [paste](https://paste.sr.ht/~euantorano/ad8df630ddcec58266c8e258a6a64fe583a2070f), as GitHub's Markdown parser tries to format quotes within a code block...