title: Git merge commits from a specific upstream release
body: <p>Scenario: I've forked a github project and begun working on it (after adding the original project as a remote called 'upstream'). While working on my fork, a number of  releases are made to the upstream project: v1.3-stable, v1.4-stable, v1.5-experimental, etc. Now I need to merge in the upstream commits to my master branch, but ONLY up to a specific release, for example, release v1.4-stable. What's the best workflow for this scenario?</p>