Activate new choreographer custom encoder

Author: ayjayt

src/py/kaleido/kaleido.py

@@ -12,8 +12,10 @@
 
 import choreographer as choreo
 import logistro
+from choreographer import channels
 from choreographer.errors import ChromeNotFoundError
 from choreographer.utils import TmpDirectory
+from plotly.utils import PlotlyJSONEncoder
 
 from ._fig_tools import _is_figurish, build_fig_spec
 from ._kaleido_tab import _KaleidoTab
@@ -28,6 +30,8 @@
 
 _logger = logistro.getLogger(__name__)
 
+channels.register_custom_encoder(PlotlyJSONEncoder)
+
 # Show a warning if the installed Plotly version
 # is incompatible with this version of Kaleido
 warn_incompatible_plotly()