disable one limit test - it's server specific

tests/LimitOrderTest.php

@@ -126,10 +126,18 @@ public function testLimit()
 
         $i = clone $ii;
         $i->setLimit(null, 1);
+        /*
+        This test is incorrect because last number in rendered query is dependant on server.
+        For example, on Imants Win10 64-bit this renders as:
+        select `total_net` from `invoice` order by `total_net` limit 1, 2147483647
+        On Travis server it renders as:
+        select `total_net` from `invoice` order by `total_net` limit 1, 9223372036854775807
+        which still is not equal to max number which SQL server allows - 18446744073709551615
         $this->assertEquals(
             'select `total_net` from `invoice` order by `total_net` limit 1, 9223372036854775807',
             $i->action('select')->render()
         );
+        */
         $this->assertEquals([
             ['total_net' => 15],
             ['total_net' => 20],