version of visNetwork in "suggests" needs to be bumped (v2.1.2 works)

[corypdavis]

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Description

Hi there, thankyou for this awesome package. I just found a minor issue with an easy fix:

version 2.0.9 of visNetwork doesn't support the zoomSpeed argument used in class_visnetwork.R. I have successfully tested with visNetwork 2.1.2

[wlandau]

Thanks for mentioning this, should be fixed now.