Unordered and ordered lists are combined

### I'm submitting a...
- [x] Bug report
- [ ] Feature request

### Reproduction steps
The minimal markdown input required to reproduce the bug is the following:
```
- unordered
1. ordered
```

It displays the following:
- unordered
- ordered

Github displays it correctly:
- unordered
1. ordered

Two newlines still counts as one list and displays the buggy behaviour:
```
- unordered

1. ordered
```

When there are three newlines, it stops exhibiting the behaviour:
```
- unordered

1. ordered
```

### Version information
Browser type and version: Chrome, Version 72.0.3626.96 (Official Build) (64-bit)
EasyMDE version: Unsure, it is present on https://easymde.tk/