Added private constructor and removed unused switch case.

Author: majusko

src/main/java/io/github/majusko/pulsar/PulsarSpringStarterUtils.java

@@ -9,6 +9,9 @@
 
 public class PulsarSpringStarterUtils {
 
+    private PulsarSpringStarterUtils() {
+    }
+
     private static <T> Schema<?> getGenericSchema(Serialization serialization, Class<T> clazz) throws RuntimeException {
         switch (serialization) {
             case JSON: {
@@ -20,9 +23,6 @@ private static <T> Schema<?> getGenericSchema(Serialization serialization, Class
             case STRING: {
                 return Schema.STRING;
             }
-            case BYTE: {
-                return Schema.BYTES;
-            }
             default: {
                 throw new ProducerInitException("Unknown producer schema.");
             }