Dkb-robo

**Bugfixes**:

- 30 - handle attribute errors in case of empty documentlist
- 31 - avoid overrides in case of duplicate document names

**Features**:

- 29 - add method to retrieve depot status

**Improvements**:

- convert numbers to float wherever possible

- obsolete version.py to address [28](https://github.com/grindsa/dkb-robo/pull/28)

**Features**:

- [reserved transactions ("vorgemerke Buchungen") support](https://github.com/grindsa/dkb-robo/pull/26/files)

**Improvements**:

- [date_from/date_to validation against minimal date](https://github.com/grindsa/dkb-robo/issues/25)

**Features**:

- add amount `amount_original` ("ursprünglicher Betrag") field to creditcard transaction list

**Improvements**:

- adding code-review badge from [lgtm.com](https://lgtm.com/projects/g/grindsa/dkb-robo/?mode=list)
- some smaller fixes to address [lgtm code-review comments](https://lgtm.com/projects/g/grindsa/dkb-robo/alerts/?mode=list)