fix typo in the appveyor 3.4 test
fix typo in the appveyor 3.4 test

mrshirts/pymbar,mrshirts/pymbar,mrshirts/pymbar,Lnaden/pymbar,Lnaden/pymbar,choderalab/pymbar,choderalab/pymbar,choderalab/pymbar,mrshirts/pymbar,Lnaden/pymbar