:lipstick: fix rest description

```
$ virtualenv env
$ source env/bin/activate
$ pip install collective.checkdocs
$ python setup.py checkdocs
running checkdocs
<string>:39: (ERROR/3) Unknown target name: "dpkg".
<string>:300: (ERROR/3) Unknown target name: "# 84".
<string>:308: (ERROR/3) Unknown target name: "# 84".
error: long_description had reST syntax errors
```
Merge pull request #108 from dnozay/fix_long_description

:lipstick: fix rest description