Update change log for impending 1.5 release
Update change log for impending 1.5 release

linearregression/log-courier,linearregression/log-courier,MichaelLiZhou/log-courier,scrapinghub/log-courier,MichaelLiZhou/log-courier,dixitk13/log-courier,dixitk13/log-courier,srizzling/log-courier,scrapinghub/log-courier,srizzling/log-courier,MichaelLiZhou/log-courier,scrapinghub/log-courier,dixitk13/log-courier,srizzling/log-courier,linearregression/log-courier