Remove "short params" bench

Performance may be vary, depends on character used in params.
Hence the result is not reliable.

README.md

@@ -42,7 +42,6 @@ https://badgen.now.sh/
 `npm run bench` on my iMac5K(Late 2014), 3.5G i5, with Node.js 10.5.0:
 
 ```bash
-generate by short params x 1,085,052 ops/sec ±1.03% (83 runs sampled)
 generate by long params  x 1,046,942 ops/sec ±0.61% (93 runs sampled)
 generate by full params  x 1,266,881 ops/sec ±0.76% (91 runs sampled)
 ```

bench/index.js

@@ -1,12 +1,10 @@
 const { Suite } = require('benchmark')
 const badgen = require('..')
 
-const shortParams = { subject: '1', status: '2' }
 const longParams = { subject: 'build-build-build', status: 'passing-passing-passing' }
 const fullParams = { subject: 'license', status: 'MIT', color: 'cyan' }
 
 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)))