Change to warning

Author: tfrommen

HM/Sniffs/PHP/IssetSniff.php

@@ -23,7 +23,7 @@ public function process( File $phpcsFile, $stackPtr ) {
 
 		$comma_token = $phpcsFile->findNext( T_COMMA, $open_parenthesis_token + 1 );
 		if ( $comma_token !== false && $comma_token < $tokens[ $open_parenthesis_token ]['parenthesis_closer'] ) {
-			$phpcsFile->addError( 'Only one argument is allowed per ISSET call', $stackPtr, 'MultipleArguments' );
+			$phpcsFile->addWarning( 'Only one argument should be used per ISSET call', $stackPtr, 'MultipleArguments' );
 		}
 	}
 }

tests/fixtures/fail/isset.php.json

@@ -2,13 +2,13 @@
 	"3": [
 		{
 			"source": "HM.PHP.Isset.MultipleArguments",
-			"type": "error"
+			"type": "warning"
 		}
 	],
 	"4": [
 		{
 			"source": "HM.PHP.Isset.MultipleArguments",
-			"type": "error"
+			"type": "warning"
 		}
 	]
 }