diff --git a/.travis.yml b/.travis.yml
index db38e6d..9f1cc54 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,7 @@
 sudo: false
 
+dist: trusty
+
 language: php
 
 php:
diff --git a/EmailValidator/EmailLexer.php b/EmailValidator/EmailLexer.php
index e27a4b8..4485728 100644
--- a/EmailValidator/EmailLexer.php
+++ b/EmailValidator/EmailLexer.php
@@ -88,6 +88,9 @@ class EmailLexer extends AbstractLexer
         $this->previous = $this->token = self::$nullToken;
     }
 
+    /**
+     * @return void
+     */
     public function reset()
     {
         $this->hasInvalidTokens = false;
@@ -228,6 +231,9 @@ class EmailLexer extends AbstractLexer
         return false;
     }
 
+    /**
+     * @return string
+     */
     protected function getModifiers()
     {
         return 'iu';
diff --git a/composer.json b/composer.json
index 36bd0ca..4956da9 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
   ],
   "extra": {
     "branch-alias": {
-      "dev-master": "2.0.x-dev"
+      "dev-master": "2.1.x-dev"
     }
   },
   "repositories": [