version bump -> 1.2.9 (thread lock and mpl date fixes)
version bump -> 1.2.9 (thread lock and mpl date fixes)

plotly/plotly.py,plotly/python-api,ee-in/python-api,plotly/plotly.py,plotly/python-api,plotly/python-api,ee-in/python-api,plotly/plotly.py,ee-in/python-api