shouldn't need credentials to create a `plotlyfig` now that `plotlyfig`s are used in offline mode

[chriddyp]

"Error using ==> plotlyfig>plotlyfig.plotlyfig at 47
Oops! You must be signed in to initialize a plotlyfig object."

cc @cldougl @BRONSOLO

[BRONSOLO]

good call! 💯

[chepyle]

I just encountered this issue: plot(1:10); fig2plotly(gcf, 'offline', true); results in the Oops! offline error

Any update on this bug?