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Add singleNum.ts; Bump jest & eslint versions

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Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,20 @@`
	`1`	`+const arr = [0, 1, 0, 1, 0, 1, 99];`
	`2`	`+`
	`3`	`+const singleNum = (arr: number[]) => {`
	`4`	`+ let candidates = new Set();`
	`5`	`+ let countsMap: { [key: number]: number } = {};`
	`6`	`+ for (let num of arr) {`
	`7`	`+ if (!countsMap[num]) {`
	`8`	`+ candidates.add(num);`
	`9`	`+ countsMap[num] = 1;`
	`10`	`+ } else {`
	`11`	`+ if (candidates.has(num)) {`
	`12`	`+ candidates.delete(num);`
	`13`	`+ }`
	`14`	`+ countsMap[num] += 1;`
	`15`	`+ }`
	`16`	`+ }`
	`17`	`+ const [result] = [...candidates];`
	`18`	`+ return result;`
	`19`	`+}`
	`20`	`+`

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