fix(package.json): use non-broken connect version

Connect versions 2.18 and higher cause node to throw an error.
See issue:  https://github.com/AveVlad/gulp-connect/issues/59
Reproduced using node version 0.10.26 and 0.10.28.
Merge pull request #60 from networkerror/master

fix(package.json): use non-broken connect version