refator: use error-first-handler

lib/type/commits.js

@@ -2,13 +2,12 @@
 
 var git = require('conventional-changelog/lib/git')
 
-module.exports = function (cb) {
-  git.latestTag(function (err, from) {
-    if (err) return cb(err)
+var efh = require('../error').efh
 
-    git.getCommits({from: from}, function (err, commits) {
-      if (err) return cb(err)
+module.exports = function (cb) {
+  git.latestTag(efh(cb)(function (from) {
+    git.getCommits({from: from}, efh(cb)(function (commits) {
       cb(null, commits)
-    })
-  })
+    }))
+  }))
 }

lib/type/index.js

@@ -1,12 +1,11 @@
 'use strict'
 
-var commits = require('./commits')
 var analyze = require('./analyze')
+var commits = require('./commits')
+var efh = require('../error').efh
 
 module.exports = function (cb) {
-  commits(function (err, commits) {
-    if (err) return cb(err)
-
+  commits(efh(cb)(function (commits) {
     cb(null, analyze(commits))
-  })
+  }))
 }