feat(last-release): add custom dist-tag

src/lib/last-release.js

@@ -1,3 +1,5 @@
+const SemanticReleaseError = require('@semantic-release/error')
+
 const npmlog = require('npmlog')
 const RegClient = require('npm-registry-client')
 
@@ -11,11 +13,14 @@ module.exports = function (pkg, npmConfig, cb) {
     if (err && err.statusCode === 404) return cb(null, {})
     if (err) return cb(err)
 
-    const version = data['dist-tags'].latest
+    const version = data['dist-tags'][npmConfig.tag]
+
+    if (!version) return cb(new SemanticReleaseError(`There is no release with the dist-tag "${npmConfig.tag}" yet. Tag a version first.`, 'ENODISTTAG'))
 
     cb(null, {
       version,
-      gitHead: data.versions[version].gitHead
+      gitHead: data.versions[version].gitHead,
+      tag: npmConfig.tag
     })
   })
 }