Merge pull request #361 from torchbox/fix/typo-pr-template

Fix typo in PR template

Author: helenb

.github/pull_request_template.md

@@ -64,7 +64,7 @@
 
 - [ ] Images are optimised and lazy-loading used where appropriate
 - [ ] SVGs have been optimised
-- [ ] Perfomance and transfer of data considered
+- [ ] Performance and transfer of data considered
 - [ ] If JavaScript is needed alternatives have been considered
 - [ ] Not required