Add clarifying comment

Author: rekmarks

src/repo.ts

@@ -309,7 +309,7 @@ export async function hasChangesInDirectorySinceGitTag(
       tagName,
     );
 
-    /* istanbul ignore else */
+    /* istanbul ignore else: This condition is just to please ESLint */
     if (!(tagName in CHANGED_FILE_PATHS_BY_TAG_NAME)) {
       CHANGED_FILE_PATHS_BY_TAG_NAME[tagName] = changedFilePaths;
     }