Remove references to updating the changelog

docs/pull_requests.md

@@ -12,7 +12,6 @@ AzureML workspace. A member of the InnerEye team will be happy to assist then.
 by pressing Ctrl+Alt+L, or selecting "Reformat code" in the context menu of the file(s) in the project explorer window.
 Alternatively, you should tick all of "Reformat code", "Rearrange code", "Optimize imports", "Cleanup", "Scan with mypy"
 in the PyCharm version control check-in dialog.
-* Ensure that you modified [CHANGELOG.md](../CHANGELOG.md) and described your PR there.
 * Only publish your PR for review once you have a build that is passing. You can make use of the "Create as Draft"
 feature of GitHub.
 * Link the correct Github issue.

pull_request_template.md

@@ -6,7 +6,5 @@ Please follow the guidelines for PRs contained [here](docs/pull_requests.md). Ch
 - [ ] Add unit tests for all functions that you introduced or modified.
 - [ ] Run PyCharm's code cleanup tools on your Python files.
 - [ ] Link the correct GitHub issue for tracking.
-- [ ] Update the [Changelog](CHANGELOG.md) file: Describe your change in terms of 
-Added/Changed/Removed/... in the "Upcoming" section.
 - [ ] When merging your PR, replace the default merge message with a description of your PR,
 and if needed a motivation why that change was required.