plotlyupdate.m references old **MATLAB-api** repo name

[BRONSOLO]

plotlyupdate.m is currently failing with the following error message:

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[UPDATING] Plotly v.2.2.6 ----> Plotly v.2.2.7 
************************************************


An error occured while updating to the newest version 
of Plotly v.2.2.7. Please check your write permissions
for your outdated Plotly directories with your system admin.
Contact chuck@plot.ly for more information.


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[UPDATE UNSUCCESSFUL] visit: https://plot.ly/matlab 
or contact: chuck@plot.ly for further information. 
***************************************************

The actual issue is that the update script is referencing the old MATLAB-api repo name and failing to locate the necessary files throughout the update.

fyi @cldougl