While working on a feature branch, you probably like to merge daily or perhaps more often, but when you work on long-living feature branches, you end up in a situation where you have the same conflicts occurring repeatedly.
Here, you can use git rerere, which stands for reuse recorded resolution. Git rerere is not enabled by default, but can be enabled with the following command:
$ git config rerere.enabled true
You can configure it globally by adding --global to the git config command.