Stably sort commits

Author: cjbarth

lib/src/Gren.js

@@ -1146,6 +1146,11 @@ class Gren {
             commits = commits.filter((commit) =>
                 branchCommitShas.includes(commit.sha)
             );
+            commits.sort(
+                (commit1, commit2) =>
+                    new Date(commit2.commit.committer.date) -
+                    new Date(commit1.commit.committer.date)
+            );
             releaseRange.push(commits);
         }
         loadedCommits('Commits acquired');