/ofl/*/OFL.txt missing line after Copyright notice

When I added the missing families to this repo, some of the OFL.txt files did not include a gap between the copyright string (first line) and the rest of the text. e.g:

**Incorrect**
```
Copyright 2017 The Font Project Authors (git repo url)
This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL
```

**Correct**
```
Copyright 2017 The Font Project Authors (git repo url)

This Font Software is licensed under the SIL Open Font License, Version 1.1.
This license is copied below, and is also available with a FAQ at:
http://scripts.sil.org/OFL
```

@davelab6 went on a mission and fixed a lot of these by hand. I've just written a quick [script](https://gist.github.com/m4rc1e/82f42fae7121f45aeb8d8a7c83f6d614) to see if we have any of them still out standing. The only incorrect OFL.txt files left are:

- [ ] ./ofl/kantumruy/OFL.txt
- [ ] ./ofl/kdamthmor/OFL.txt
- [ ] ./ofl/knewave/OFL.txt
- [ ] ./ofl/nanummyeongjo/OFL.txt

These are very messed up though. Eg,

**knewave**

A lot of the OFL.txt files use Win line endings, \r\n, whilst others use Unix, \n. I don't know whether this is a major issue though.