Commit 1478201

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Replace HashMap dependency with built-in Map

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Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,3 @@`
`1`		`-const HashMap = require('hashmap');`
`2`	`1`	`const Queue = require('../../../Queue');`
`3`	`2`
`4`	`3`	`// Determines the bottom view of a binary tree`
`@@ -15,7 +14,7 @@ module.exports = function bottomView(binaryTree) {`
`15`	`14`	`const horizontalDistance = 0;`
`16`	`15`
`17`	`16`	`// create a map to track most recent visited nodes per hd`
`18`		`- const hdToNodeValue = new HashMap();`
	`17`	`+ const hdToNodeValue = new Map();`
`19`	`18`
`20`	`19`	`// perform bfs`
`21`	`20`	`const q = new Queue();`

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