feat(prompter): Add the support of auto prepend the wording: "BREAKING CHANGE: " to the long descrip

Add the support of preprend the wording "BREAKING CHANGE: " to the long description by asking for a

simple question before writing the long description.

commitizen#17

Author: Ezequiel Bergamaschi

engine.js

@@ -56,6 +56,10 @@ module.exports = function (options) {
           type: 'input',
           name: 'subject',
           message: 'Write a short, imperative tense description of the change:\n'
+        }, {
+          type: 'input',
+          name: 'breaking',
+          message: 'Does your change include a breaking change? [y/n]:\n'
         }, {
           type: 'input',
           name: 'body',
@@ -76,6 +80,11 @@ module.exports = function (options) {
           width: maxLineWidth
         };
 
+        var breaking = answers.breaking[0].trim().toLowerCase() === 'y';
+        if (breaking) {
+            answers.body = "BREAKING CHANGE: " + answers.body;
+        }
+
         // parentheses are only needed when a scope is present
         var scope = answers.scope.trim();
         scope = scope ? '(' + answers.scope.trim() + ')' : '';