Update release.rst
Update release.rst

Suspected typo typo in 0.8.1 release notes.
mattions/pysam,carolinux/pysam,bioinformed/pysam,bioinformed/pysam,dannon/pysam,kyleabeauchamp/pysam,mattions/pysam,brendanofallon/pysam,daler/pysam,pysam-developers/pysam,mattions/pysam,pysam-developers/pysam,nlhepler/pysam,kyleabeauchamp/pysam,dannon/pysam,TyberiusPrime/pysam,TyberiusPrime/pysam,pysam-developers/pysam,carolinux/pysam,brendanofallon/pysam,bioinformed/pysam,bioinformed/pysam,kyleabeauchamp/pysam,nlhepler/pysam,mattions/pysam,brendanofallon/pysam,brendanofallon/pysam,kyleabeauchamp/pysam,dannon/pysam,dannon/pysam,nlhepler/pysam,TyberiusPrime/pysam,bioinformed/pysam,nlhepler/pysam,mattions/pysam,carolinux/pysam,kyleabeauchamp/pysam,TyberiusPrime/pysam,TyberiusPrime/pysam,carolinux/pysam,nlhepler/pysam,pysam-developers/pysam,daler/pysam,daler/pysam,brendanofallon/pysam,daler/pysam,carolinux/pysam,daler/pysam,dannon/pysam