Update README.md

Updated instructions for better grammar.
3 years ago · 9462b5e8c3
1 changed files with 1 additions and 1 deletions
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 ### Instructions

-Write a function that returns `true` if the `string` passed as a parameter only contains numerical characters, and returns `false` otherwise.
+Write a function that returns `true` if the `string` passed as a parameter contains only numerical characters; returns `false` otherwise.

 ### Expected function