Unable to compile basic examples from current clone

[lwhite1]

Hi, Just getting started with this awesome library.

I cloned the repo, opened up the histogram example in Idea, and tried to run it. The class was
com.metsci.glimpse.examples.basic.HistogramPlotExample

I got this compilation error:

Error:(375, 32) java: incompatible types: java.util.List<capture#1 of ? extends K> cannot be converted to java.util.List<K>

compiling this method:

    public static final <K> List<K> newUnmodifiableList( Collection<? extends K> c )
    {
        return unmodifiableList( newArrayList( c ) );
    }

in the package com.metsci.glimpse.util;

Guidance would be greatly appreciated. Thank you.