ci: update commitlint config (#17)

Author: Deyang-Dai

commitlint.config.js

@@ -1 +1,6 @@
-module.exports = { extends: ['@commitlint/config-conventional'] };
+module.exports = {
+    extends: ['@commitlint/config-conventional'],
+    rules: {
+        'body-max-line-length': [2, 'always', 140],
+    },
+};