Added linters and fixed linter warnings

example.js

@@ -1,11 +1,13 @@
-const ShiftStats = require('./index')
+'use strict';
 
-let s = new ShiftStats()
+const ShiftStats = require('./index');
+
+let s = new ShiftStats();
 // with promises
 s.login().then(() => {
-  return s.divisionStandings(4702)
-}).then(async (standings) => {
-  console.log(standings.teams)
+  return s.divisionStandings(4702);
+}).then(async(standings) => {
+  console.log(standings.teams);
   // with async/await
-  console.log((await s.gameGoals(166658, 'home')).home_goals)
-})
+  console.log((await s.gameGoals(166658, 'home')).home_goals);
+});