refactor(error): use error module

package.json

@@ -9,13 +9,13 @@
     "nyc": {
       "exclude": [
         ".test",
-        "node_modules",
-        "dist/lib/error.js"
+        "node_modules"
       ]
     }
   },
   "dependencies": {
     "@semantic-release/commit-analyzer": "^1.0.0",
+    "@semantic-release/error": "^1.0.0",
     "@semantic-release/release-notes-generator": "^1.0.0",
     "lodash": "^3.9.3",
     "nopt": "^3.0.3",

src/lib/error.js

@@ -1,7 +0,0 @@
-module.exports = class SemanticReleaseError extends Error {
-  constructor (message, code) {
-    super()
-    this.message = message
-    this.code = code
-  }
-}

src/lib/type.js

@@ -1,4 +1,4 @@
-const SemanticReleaseError = require('./error')
+const SemanticReleaseError = require('@semantic-release/error')
 
 module.exports = function (plugins, commits, lastRelease, cb) {
   plugins.analyzeCommits(commits, (err, type) => {

src/lib/verify.js

@@ -1,4 +1,4 @@
-const SemanticReleaseError = require('./error')
+const SemanticReleaseError = require('@semantic-release/error')
 
 module.exports = function (pkg, options, env) {
   let errors = []