Moved RTD environment to use conda-forge.

Author: cgranade

doc/environment.yml

@@ -1,6 +1,7 @@
 name: qinfer
+channels:
+  - conda-forge
 dependencies:
-  - cython
   - numpy
   - scipy
   - scikit-learn
@@ -12,9 +13,7 @@ dependencies:
   - pytest-xdist
   - coveralls
   - pylint
+  - qutip
   - pip:
     # We also add additional tools for plotting.
     - mpltools
-    # We use the PyPI version of QuTiP here since the conda version
-    # is on the wrong channel for use with RTD.
-    - qutip