Fix: Remove unused dependencies to devDependencies
Fix: Remove unused dependencies to devDependencies

Unused dependencies are causing downstream issues (such as Karma
flagging itsself as unable to run on newer node versions) that stop
logdown being installed.

The dependencies have been updated to the maximum of their
'devDependency' and 'dependency' values.

caiogondim/logdown.js,caiogondim/logdown.js