fix typo
fix typo

@lastlegion, here's the place, thanks!
fixes #1051

mtraynham/dc.js,gazal-k/dc.js,maackle/dc.js,dc-js/dc.js,becompany/dc.js,TheDataShed/dc.js,maackle/dc.js,maackle/dc.js,TheDataShed/dc.js,ruhley/dc.js,gazal-k/dc.js,ruhley/dc.js,Hauenstein/dc.js,Hauenstein/dc.js,TheDataShed/dc.js,mtraynham/dc.js,Hauenstein/dc.js,aaronhoffman/dc.js,aaronhoffman/dc.js,Hauenstein/dc.js,dc-js/dc.js,aaronhoffman/dc.js,gazal-k/dc.js,TheDataShed/dc.js,dc-js/dc.js,becompany/dc.js,maackle/dc.js,ruhley/dc.js,TheDataShed/dc.js,r4j4h/dc.js,r4j4h/dc.js,mtraynham/dc.js,ruhley/dc.js,maackle/dc.js,gazal-k/dc.js,r4j4h/dc.js,ruhley/dc.js,Hauenstein/dc.js,becompany/dc.js,r4j4h/dc.js,gazal-k/dc.js,aaronhoffman/dc.js,dc-js/dc.js,aaronhoffman/dc.js,dc-js/dc.js,mtraynham/dc.js,mtraynham/dc.js,r4j4h/dc.js