add diff-cover.html report
add diff-cover.html report

kdmurray91/khmer,kdmurray91/khmer,F1000Research/khmer,souravsingh/khmer,Winterflower/khmer,ged-lab/khmer,Winterflower/khmer,jas14/khmer,kdmurray91/khmer,ged-lab/khmer,souravsingh/khmer,jas14/khmer,souravsingh/khmer,F1000Research/khmer,F1000Research/khmer,ged-lab/khmer,Winterflower/khmer,jas14/khmer