Simplify benchmarks

bench/index.js

@@ -1,12 +1,13 @@
 const { Suite } = require('benchmark')
 const badgen = require('..')
 
-new Suite().add('generate by short params', function () {
-  badgen({ subject: 'b', status: 'p' })
-}).add('generate by long params ', function () {
-  badgen({ subject: 'build-build-build', status: 'passing-passing-passing' })
-}).add('generate by full params ', function () {
-  badgen({ subject: 'license', status: 'Apache-2.0', color: 'blue' })
-}).on('cycle', function (event) {
-  console.log(String(event.target))
-}).run()
+const shortParams = { subject: 'b', status: 'p' }
+const longParams = { subject: 'build-build-build', status: 'passing-passing-passing' }
+const fullParams = { subject: 'license', status: 'Apache-2.0', color: 'blue' }
+
+new Suite()
+  .add('generate by short params', () => badgen(shortParams))
+  .add('generate by long params ', () => badgen(longParams))
+  .add('generate by full params ', () => badgen(fullParams))
+  .on('cycle', event => console.log(String(event.target)))
+  .run()