modified requirements

Author: emmanuelle

.circleci/create_conda_optional_env.sh

@@ -16,7 +16,7 @@ if [ ! -d $HOME/miniconda/envs/circle_optional ]; then
     # Create environment
     # PYTHON_VERSION=2.7 or 3.5
     $HOME/miniconda/bin/conda create -n circle_optional --yes python=$PYTHON_VERSION \
-requests nbformat six retrying psutil pandas decorator pytest mock nose poppler xarray scikit-image ipython jupyter ipykernel ipywidgets statsmodels
+requests nbformat six retrying psutil pandas decorator pytest mock nose poppler xarray scikit-image ipython jupyter ipykernel ipywidgets statsmodels pypng
 
     # Install orca into environment
     $HOME/miniconda/bin/conda install --yes -n circle_optional -c plotly plotly-orca==1.3.1

packages/python/plotly/optional-requirements.txt

@@ -51,5 +51,5 @@ pyshp
 geopandas
 shapely
 
-# image uri conversion
+## image uri conversion
 pillow

packages/python/plotly/requirements.txt

@@ -10,3 +10,6 @@ six==1.8.0
 
 ## retrying requests ##
 retrying==1.3.3
+
+## transforming images to png b64 strings ##
+pypng

packages/python/plotly/tox.ini

@@ -61,6 +61,7 @@ deps=
     xarray==0.10.9
     statsmodels==0.10.2
     backports.tempfile==1.0
+    pypng==0.0.20
     optional: --editable=file:///{toxinidir}/../plotly-geo
     optional: numpy==1.16.5
     optional: ipython[all]==5.1.0