update readme

Author: anasmak04

README.md

@@ -31,5 +31,5 @@
 | Problem - 27 | [Binary Search implementation with JS](https://github.com/MehedilslamRipon/Problem-solving-with-JavaScript/blob/master/problem-27.js) |
 | Problem - 28 | [Make a unique random string generator - uuid alternative lite](https://github.com/MehedilslamRipon/Problem-solving-with-JavaScript/blob/master/problem-28.js) |
 | Problem - 29 | [Given a set of numbers, return the additive inverse of each. Each positive becomes negatives, and the negatives become positives](https://github.com/anasmak04/Problem-solving-with-JavaScript/blob/master/problem-29.js) |
-| Problem - 31 | [Thinkful-Logic](https://github.com/anasmak04/Problem-solving-with-JavaScript/blob/master/problem-30.js) |
+| Problem - 30 | [Thinkful-Logic](https://github.com/anasmak04/Problem-solving-with-JavaScript/blob/master/problem-30.js) |
 <!-- | Problem - 31 | | -->