We'll check whether we can easily add those packages now (Python 3.6 was
still pretty new when ObsPy 1.0.3 was released and we overlooked not
having those packages ready)..
For a quick and short term solution, you could make a separate
environment with python 3.5 for obspy:
conda create -n py35-obspy python=3.5
# if you're on Linux, not sure what the acitvation looks like on Windows
source activate py35-obspy
conda install obspy
Alternatively you could also uninstall ObsPy with conda and re-install
with pip which should work fine with Python 3.6. But then you'll have to
remember to uninstall the pip ObsPy at one point if you want to update
it with conda...