console.log with multiple arguments doesn't handle newline

Code:

console.log('duration', turn.duration)
console.log('originalIncrement', turn.originalIncrement)
console.log('map', rebuildTimeMap(turn, text))

Output:

See the `\n` after `duration`

I suppose it is somewhere in [ProxyConsole](https://github.com/egoist/codepan/blob/7412e140a9041aae6a0ad1ec3a6e2f2072167d57/src/utils/proxy-console.js) this is handled.