Add SuppressWarnings to SLF4jLogOutputStream to unblock error-prone u…

…pgrade

src/main/java/ch/vorburger/exec/SLF4jLogOutputStream.java

@@ -33,6 +33,7 @@
  * @author Michael Vorburger
  */
 // intentionally package local
+@SuppressWarnings("MemberName") // https://errorprone.info/bugpattern/MemberName
 class SLF4jLogOutputStream extends LogOutputStream {
 
     private final OutputStreamLogDispatcher dispatcher;