Merge pull request #776 from jaschweder/patch-1

update README

README.mdown

@@ -37,8 +37,8 @@ $log = new Logger('name');
 $log->pushHandler(new StreamHandler('path/to/your.log', Logger::WARNING));
 
 // add records to the log
-$log->addWarning('Foo');
-$log->addError('Bar');
+$log->warning('Foo');
+$log->error('Bar');
 ```
 
 ## Documentation