docs(.github/pull_request_template): replace 'yarn test:coverage' with 'yarn run test:coverage' (#203)

Co-authored-by: seungrodotlee <seungrodotlee@gmail.com>

Author: sukvvon

.github/pull_request_template.md

@@ -5,5 +5,5 @@
 ## Checklist
 
 - [ ] Did you write the test code?
-- [ ] Have you run `yarn test:coverage` to make sure there is no uncovered line?
+- [ ] Have you run `yarn run test:coverage` to make sure there is no uncovered line?
 - [ ] Did you write the JSDoc?