pandoc versionen > 2.0 dropped --reference-odt/docx

[BlackLotus]

The alternative would be to check the pandoc version and use parameters depending on that.
Better solution would be to simply raise the requirement to pandoc >2

[coveralls]

Coverage remained the same at 84.863% when pulling 2444517 on BlackLotus:master into 8eac88b on rdmorganiser:master.

[coveralls]

Coverage decreased (-0.4%) to 84.485% when pulling d806305 on BlackLotus:master into 8eac88b on rdmorganiser:master.

[jochenklar]

Hi, thanks for the PR. I think Debian 9 and Centos 7 ship still with Pandoc 1.x. I think the pandoc python wrapper has a function to get the version. We will look into it (soon).

[BlackLotus]

Updated the pull request to check the pandoc version.
I checked against 1.x to fallback to the old way, everything else is "new".
I guess support 1.x is still ok, but if someone has 0.x he/she will have to update. Future releases should work (unless they again change the syntax)

[triole]

Approved.