Update contributing.md for repo's license name

Author: Jeffrey-Luszcz

contributing.md

@@ -2,7 +2,7 @@
 
 Hi there! We're thrilled that you'd like to contribute to this project. Your help is essential for keeping it great.
 
-Contributions to this project are released to the public under the project's [open source license](./licensing.txt).
+Contributions to this project are released to the public under the project's [open source license](./license.txt).
 
 Please note that this project is released with a [Contributor Code of Conduct](./code-of-conduct.md). By participating in this project you agree to abide by its terms.