Update pull request template

Author: vikasnautiyal

.github/PULL_REQUEST_TEMPLATE

@@ -12,7 +12,7 @@ Closes #2
 ### Checklist
 - [ ] I have made a material change to the repo (functionality, testing, spelling, grammar)
 - [ ] I have read the [Contribution Guide] and my PR follows them.
-- [ ] I updated my branch with the master branch.
+- [ ] I updated my branch with the development branch.
 - [ ] I have added tests that prove my fix is effective or that my feature works
 - [ ] I have added necessary documentation about the functionality in the appropriate .md file
 - [ ] I have added in line documentation to the code I modified