README.rst minor edit for style
README.rst minor edit for style

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