Commit 042670a

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update: added k smallest elements problem

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	`1`	`+/**`
	`2`	`+ * Find 4 smallest elements in an array`
	`3`	`+ */`
	`4`	`+`
	`5`	`+const MinHeap = require('../../_DataStructures_/Heaps/MinHeap');`
	`6`	`+`
	`7`	`+function findKSmallest(collection, k) {`
	`8`	`+ if (!collection \|\| !Array.isArray(collection)) {`
	`9`	`+ throw new Error('Invalid / missing collection');`
	`10`	`+ }`
	`11`	`+`
	`12`	`+ // create a MinHeap using the collection`
	`13`	`+ const mh = new MinHeap(collection);`
	`14`	`+ const result = [];`
	`15`	`+ for (let i = 0; i < k; i += 1) {`
	`16`	`+ result.push(mh.getMin());`
	`17`	`+ }`
	`18`	`+ return result;`
	`19`	`+}`
	`20`	`+`
	`21`	`+module.exports = findKSmallest;`

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