Make benchmark script output a bit nicer

bench/index.js

@@ -1,6 +1,16 @@
 const Vain = require('..');
+const prettyMs = require('pretty-ms');
 
-const vain = new Vain({prefix: 'BTC'});
+const prefix = 'Luke';
+console.log();
+console.log(`Searching for the prefix "${prefix}"...`);
+
+const vain = new Vain({prefix});
 const result = vain.start();
 
-console.log(result);
+console.log();
+console.log(`Address: ${result.address}`);
+console.log(`WIF: ${result.wif}`);
+console.log();
+console.log(`Found in ${prettyMs(result.duration)}`);
+console.log(`Trys per second: ${result.trysPerSecond}`);

package.json

@@ -31,6 +31,7 @@
     "ava": "^0.25.0",
     "coveralls": "^3.0.2",
     "nyc": "^13.1.0",
+    "pretty-ms": "^5.0.0",
     "xo": "^0.23.0"
   },
   "dependencies": {