Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/laravel/framework/src/Illuminate/Auth/DatabaseUserProvider.php

@@ -4,6 +4,7 @@ namespace Illuminate\Auth;
 
 use Illuminate\Support\Str;
 use Illuminate\Contracts\Auth\UserProvider;
+use Illuminate\Contracts\Support\Arrayable;
 use Illuminate\Database\ConnectionInterface;
 use Illuminate\Contracts\Hashing\Hasher as HasherContract;
 use Illuminate\Contracts\Auth\Authenticatable as UserContract;
@@ -110,7 +111,13 @@ class DatabaseUserProvider implements UserProvider
         $query = $this->conn->table($this->table);
 
         foreach ($credentials as $key => $value) {
-            if (! Str::contains($key, 'password')) {
+            if (Str::contains($key, 'password')) {
+                continue;
+            }
+
+            if (is_array($value) || $value instanceof Arrayable) {
+                $query->whereIn($key, $value);
+            } else {
                 $query->where($key, $value);
             }
         }