Log Message:
(www/R-htmlwidget) Updated 1.5.3 to 1.5.4

htmlwidgets 1.5.4
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* Closed #320: `getDependency()` no longer includes an absolute src path in its \ 
return value. (#384)
* Fixed #408: An error type-check did not work correctly because it was missing \ 
parentheses. (#409)