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Merge pull request youngyangyang04#2787 from gazeldx/master

Update 0202.快乐数.md 增加 Ruby 版本实现

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`@@ -534,6 +534,30 @@ public class Solution {`
`534`	`534`	`}`
`535`	`535`	```
`536`	`536`
	`537`	`+### Ruby:`
	`538`	`+`
	`539`	+```ruby
	`540`	`+# @param {Integer} n`
	`541`	`+# @return {Boolean}`
	`542`	`+def is_happy(n)`
	`543`	`+ @occurred_nums = Set.new`
	`544`	`+`
	`545`	`+ while true`
	`546`	`+ n = next_value(n)`
	`547`	`+`
	`548`	`+ return true if n == 1`
	`549`	`+`
	`550`	`+ return false if @occurred_nums.include?(n)`
	`551`	`+`
	`552`	`+ @occurred_nums << n`
	`553`	`+ end`
	`554`	`+end`
	`555`	`+`
	`556`	`+def next_value(n)`
	`557`	`+ n.to_s.chars.sum { \|char\| char.to_i ** 2 }`
	`558`	`+end`
	`559`	+```
	`560`	`+`
`537`	`561`	`<p align="center">`
`538`	`562`	`<a href="https://programmercarl.com/other/kstar.html" target="_blank">`
`539`	`563`	`<img src="../pics/网站星球宣传海报.jpg" width="1000"/>`

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