BUGFIX: Allow deprecations to work in vim too.

* Remove line breaks from output, as syntastic will not parse them.
* It's up to the report to format the messages, not the Sniff.

Relates: #33

src/Standards/Typo3Update/Sniffs/Deprecated/AjaxRegistrationSniff.php

@@ -81,8 +81,8 @@ class Typo3Update_Sniffs_Deprecated_AjaxRegistrationSniff implements PhpCsSniff
         }
 
         $phpcsFile->addWarning(
-            "Defining AJAX using %s is no longer supported with a single String like %s.\n"
+            'Defining AJAX using %s is no longer supported with a single String like %s.'
-            . "Since TYPO3 7.6, use PSR-7-based Routing for Backend AJAX Requests.\n"
+            . ' Since TYPO3 7.6, use PSR-7-based Routing for Backend AJAX Requests.'
             . ' See: %s',
             $tokenToCheck,
             '',

src/Standards/Typo3Update/Sniffs/Deprecated/GenericFunctionCallSniff.php

@@ -101,9 +101,7 @@ class Typo3Update_Sniffs_Deprecated_GenericFunctionCallSniff implements PhpCsSni
         $functionCall = $token['content'];
 
         $phpcsFile->addWarning(
-            "Legacy function calls are not allowed; found %s.\n"
+            'Legacy function calls are not allowed; found %s. %s. See: %s',
-                . "%s.\n"
-                . "See: %s",
             $tokenPosition,
             $functionCall,
             [