trial fix of readthedocs dependencies 2

docs/caesar.yml

@@ -1,44 +1,19 @@
 name: caesar
 dependencies:
-- alabaster=0.7.7=py27_0
-- babel=2.3.3=py27_0
-- cycler=0.10.0=py27_0
-- cython=0.24=py27_0
-- docutils=0.12=py27_0
-- freetype=2.5.5=0
-- h5py=2.6.0=np111py27_1
-- hdf5=1.8.16=0
-- imagesize=0.7.1=py27_0
-- jinja2=2.8=py27_0
-- libpng=1.6.17=0
-- markupsafe=0.23=py27_0
-- matplotlib=1.5.1=np111py27_0
-- mkl=11.3.3=0
-- mpmath=0.19=py27_0
-- numpy=1.11.0=py27_1
-- numpydoc=0.5=py27_1
-- openssl=1.0.2h=0
-- pip=8.1.1=py27_1
-- pygments=2.1.3=py27_0
-- pyparsing=2.1.1=py27_0
-- pyqt=4.11.4=py27_1
-- python=2.7.11=0
-- python-dateutil=2.5.3=py27_0
-- pytz=2016.4=py27_0
-- qt=4.8.7=1
-- readline=6.2=2
-- setuptools=20.7.0=py27_0
-- sip=4.16.9=py27_0
-- six=1.10.0=py27_0
-- snowballstemmer=1.2.1=py27_0
-- sphinx=1.4.1=py27_0
-- sphinx_rtd_theme=0.1.9=py27_0
-- sqlite=3.9.2=0
-- sympy=1.0=py27_0
-- tk=8.5.18=0
-- wheel=0.29.0=py27_0
-- yt=3.2.3=py27_0
-- zlib=1.2.8=0
-- pip:
-  - sphinx-rtd-theme==0.1.9
-  - python-hglib==2.1
+- psutil==5.7.0
+- extinction==0.4.0
+- six==1.14.0
+- h5py==2.10.0
+- numpy==1.18.1
+- astropy==4.0.1.post1
+- synphot==0.3
+- fsps==0.2.2
+- joblib==0.14.1
+- scipy==1.4.1
+- yt==3.5.1
+- matplotlib==3.1.3
+- Cython==0.29.17
+- ipython==7.15.0
+- mpi4py==3.0.3
+- scikit_learn==0.23.1
+- vtk==9.0.0