Fiked typo

.github/PULL_REQUEST_TEMPLATE.md

@@ -2,7 +2,7 @@
 
 - [ ] I have written a descriptive pull-request title
 - [ ] I have verified that there are no overlapping [pull-requests](https://github.com/JimBobSquarePants/ImageSharp/pulls) open
-- [ ] I have verified that I am following matches the existing coding patterns and practise as demonstrated in the repository. These follow strict Stylecop rules :cop:.
+- [ ] I have verified that I am following matches the existing coding patterns and practice as demonstrated in the repository. These follow strict Stylecop rules :cop:.
 - [ ] I have provided test coverage for my change (where applicable)
 
 ### Description