upgrade dependece:debug version to 3.x.x #47

it was sad that jsonp's dependence lib： debug@2.x.x ， eg :debug@2.6.9, debug@^2.1.2, debug@^2.1.3, debug@^2.2.0, debug@^2.3.3, debug@^2.6.0, debug@^2.6.6, debug@^2.6.8, debug@^2.6.9
it resovle the lib "ms" to version exactly 2.0.0。
and on browser， it is not allowed mutil versions of ms bounded。