Merge pull request #2293 from plotly/pin-orca

pinning orca

Author: nicolaskruchten

.circleci/create_conda_optional_env.sh

@@ -19,5 +19,5 @@ if [ ! -d $HOME/miniconda/envs/circle_optional ]; then
 requests nbformat six retrying psutil pandas decorator pytest mock nose poppler xarray scikit-image ipython jupyter ipykernel ipywidgets
 
     # Install orca into environment
-    $HOME/miniconda/bin/conda install --yes -n circle_optional -c plotly plotly-orca
+    $HOME/miniconda/bin/conda install --yes -n circle_optional -c plotly plotly-orca=1.2.1
 fi

README.md

@@ -153,7 +153,7 @@ installation of the plotly [orca](https://github.com/plotly/orca) command line u
 These dependencies can both be installed using conda:
 
 ```
-conda install -c plotly plotly-orca psutil
+conda install -c plotly plotly-orca==1.2.1 psutil
 ```
 
 Or, `psutil` can be installed using pip...