Update Issues with WT2 Analysis Toolbox 1.3.4.md

Added @JimHokanson's comment from the [stats testing code in SegWormMatlabClasses](https://github.com/JimHokanson/SegwormMatlabClasses/blob/master/%2Bseg_worm/%2Btesting/%2Bstats/t001_oldVsNewStats.m)