Trailing line break in list element should be ignored

Give the following HTML:
```

• Item 1
  


• Item 2

the following Markdown will be generated:
```
* Item 1 \n\n* Item 2
```

Which will actually be interpreted as two distinct unordered lists instead of one list with two entries. It seems that removing trailing line breaks from list items would make for a better semantic translation.

- Version by 2016.9.19
- Python version 2.7.6