Misnamed directories

[leandrorizk]

https://github.com/takdg123/dm_analysis/blame/6de68b286be622e3c1592673f31ade943f7a8e2d/DarkMatter/const.py#L49-L50

In lines 49 and 50 of const.py, strings for two directories seem to have a capitalization error. I think they should read "/npy/eVJBins.npy" instead of "/npy/eVJbins.npy" and "/npy/eEDJBins.npy" instead of "/npy/eEDJbins.npy".