actually commit the package.json file

src/release.ts

@@ -60,7 +60,7 @@ console.log('tagging release:', pkgVersion.format(), release, newVersion.format(
      * Commit package.json, tag the repo for release, and push to develop on
      * origin.
      */
-    await simpleGit.commit(`releasing ${releaseTag} to master`);
+    await simpleGit.commit(`releasing ${releaseTag} to master`, pkgFilename);
     await simpleGit.addTag(releaseTag);
     await simpleGit.push("origin", "develop");