feat(emoji): add support to emojis on commit head

- Add support to use emojis on commit head before subject

Author: amaury-tobias

README.md

@@ -26,11 +26,12 @@ Like commitizen, you specify the configuration of cz-conventional-changelog thro
             "defaultSubject": "",
             "defaultBody": "",
             "defaultIssues": "",
+            "emojis": false,
             "types": {
               ...
               "feat": {
                 "description": "A new feature",
-                "title": "Features"
+                "emoji": "🚀"
               },
               ...
             }

engine.js

@@ -197,9 +197,10 @@ module.exports = function(options) {
 
         // parentheses are only needed when a scope is present
         var scope = answers.scope ? '(' + answers.scope + ')' : '';
+        var emoji = options.emojis ? options.types[answers.type].emoji : '';
 
         // Hard limit this line in the validate
-        var head = answers.type + scope + ': ' + answers.subject;
+        var head = answers.type + scope + ': '+ emoji + ' ' + answers.subject;
 
         // Wrap these lines at options.maxLineWidth characters
         var body = answers.body ? wrap(answers.body, wrapOptions) : false;

index.js

@@ -6,6 +6,7 @@ var configLoader = require('commitizen').configLoader;
 
 var config = configLoader.load();
 var options = {
+  emojis: config.emojis || false,
   types: config.types || conventionalCommitTypes.types,
   defaultType: process.env.CZ_TYPE || config.defaultType,
   defaultScope: process.env.CZ_SCOPE || config.defaultScope,