add psalm supression to "possibly unused methods"

Signed-off-by: Matthias Kühne <matthias.kuehne@ellerhold.de>

Author: MatthiasKuehneEllerhold

psalm.xml

@@ -34,6 +34,11 @@
                 <directory name="test" />
             </errorLevel>
         </DeprecatedMethod>
+        <PossiblyUnusedMethod>
+            <errorLevel type="suppress">
+                <directory name="test" />
+            </errorLevel>
+        </PossiblyUnusedMethod>
     </issueHandlers>
     <plugins>
         <pluginClass class="Psalm\PhpUnitPlugin\Plugin"/>