Update LRUCache.js

[awojobigodfrey]

Added a clear function for cache

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[appgurueu]

Please - at the very least - fix your indentation. Why is this feature necessary? Why can't I just call obj.cache.clear()?

[raklaptudirm]

obj.clear() is less clear then obj.cache.clear() imo.

[CarlosZoft]

Why returns "this"?

[raklaptudirm]

@appgurueu should I close this? We both seem to think it is unnecessary and less readable.