Fix travis detected bug in perl 5.20

lib/Selenium/Remote/Driver.pm

@@ -1533,8 +1533,8 @@ sub execute_script {
 sub _looks_like_element {
     my ($self, $maybe_element) = @_;
 
-    return exists $maybe_element->{ELEMENT}
-      or $maybe_element->{'element-6066-11e4-a52e-4f735466cecf'};
+    return (exists $maybe_element->{ELEMENT}
+      or exists $maybe_element->{'element-6066-11e4-a52e-4f735466cecf'});
 }
 
 # _convert_to_webelement