TST: Add Python 3.5 to Appveyor.
TST: Add Python 3.5 to Appveyor.

ramansbach/cluster_analysis,ramansbach/cluster_analysis,HBClab/xnat_BIDS,katiehamren/splash,uwescience/shablona,HBClab/NiBetaSeries,ramansbach/cluster_analysis,geoffbacon/semrep,mekman/recon,ritviksahajpal/LUH2,mfalkiewicz/diffusion_embed,ritviksahajpal/LUH2,christiancarballo/bha,ramansbach/cluster_analysis,emaudes/bha,neurohackweek/avalanche,rabernat/xrft,ritviksahajpal/pygeoutil,HBClab/NiBetaSeries,arokem/shablona,geoffbacon/semrep,INCF/pybids,xgcm/xrft