Add missing cd
Add missing cd

mitchellstern/dynet,Peilun-Li/dynet,Peilun-Li/dynet,Abasyoni/dynet,kamigaito/cnn,cherryc/dynet,mitchellstern/dynet,Abasyoni/dynet,Peilun-Li/dynet,Abasyoni/dynet,kamigaito/cnn,cherryc/dynet,cherryc/dynet