Added test and patch for `finally` as a spaced keyword

While generating a new `.jscsrc` for personal use, I noticed that `finally` is not in the list of spaced keyword for `requireSpaceAfterKeywords`

https://github.com/twolfson/node-jscs/tree/v1.7.3#requirespaceafterkeywords

Upon evaluation of the source code, I didn't find it inside of `spacedKeywords` either. To remedy this, I have added a test and added `finally` to the list.