fix(func-style): allow fat arrow declaration

Fix #22

Author: SebastienElet

lib/common.js

@@ -119,6 +119,7 @@ module.exports = {
     'func-style': [
       ERROR,
       'declaration',
+      { allowArrowFunctions: true },
     ],
     'global-require': ERROR,
     'guard-for-in': ERROR,

test/validate.mocha.js

@@ -1,5 +1,5 @@
 /* eslint-env node, mocha */
-/* eslint no-magic-numbers:0 */
+/* eslint no-magic-numbers:0 no-template-curly-in-string:0 */
 'use strict';
 
 const eslint = require('eslint');
@@ -36,6 +36,13 @@ describe('load config in eslint to check syntax', () => {
       assertCode(code);
     });
 
+    it('should allow to declare function with fat arrows', () => {
+      const code = 'const hello = name => `hello ${name}`;\n\n' +
+        'hello(\'seb\');\n';
+
+      assertCode(code);
+    });
+
     it('should disallow .only on describe', () => {
       const code = `
         var describe;