make codacy happy

Author: pongad

google-cloud-logging/src/test/java/com/google/cloud/logging/LoggingHandlerTest.java

@@ -156,9 +156,9 @@ private static byte[] renderConfig(Map<String, String> config) {
     StringBuilder str = new StringBuilder();
     for (Map.Entry<String, String> entry : config.entrySet()) {
       str.append(CONFIG_NAMESPACE)
-          .append(".")
+          .append('.')
           .append(entry.getKey())
-          .append("=")
+          .append('=')
           .append(entry.getValue())
           .append(System.lineSeparator());
     }