Added item with npm package version increasing to the PR template (#1542)

Author: ActiveChooN

.github/PULL_REQUEST_TEMPLATE.md

@@ -34,6 +34,8 @@ If you're unsure about any of these, don't hesitate to ask. We're here to help!
 - [ ] I have added tests to cover my changes
 - [ ] I have linked related issues ([read github docs](
   https://help.github.com/en/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword))
+- [ ] I have increased versions of npm packages if it is necessary ([cvat-canvas](https://github.com/opencv/cvat/tree/develop/cvat-canvas#versioning),
+[cvat-core](https://github.com/opencv/cvat/tree/develop/cvat-core#versioning), [cvat-data](https://github.com/opencv/cvat/tree/develop/cvat-data#versioning) and [cvat-ui](https://github.com/opencv/cvat/tree/develop/cvat-ui#versioning))
 
 ### License