add .yml suffix to temp env file
add .yml suffix to temp env file

New conda versions are more pedantic about requiring this.
spacetelescope/asv,spacetelescope/asv,airspeed-velocity/asv,qwhelan/asv,qwhelan/asv,airspeed-velocity/asv,spacetelescope/asv,airspeed-velocity/asv,airspeed-velocity/asv,qwhelan/asv,qwhelan/asv,spacetelescope/asv