fix(commands): have unreleased section for changelog

src/index.ts

@@ -258,13 +258,15 @@ program
     console.log("Generation of this changelog is based on commits");
 
     for (const commit of commits) {
-      const tag = semver.sort(
+      const tag =
+        semver.sort(
           (await simpleGit().tags([`--contains=${commit.hash}`])).all
-      )[0]!;
+        )[0]! || "Unreleased";
+
       const currentCommitStack = parsedCommitStacks.find(
         (commitStack) => commitStack.version === tag
       ) || {
-        version: tag || "",
+        version: tag || "Unreleased",
         breaking: [],
         features: [],
         fixes: [],