Fixup requestLogger end method

This commit aims to enable returning endLogger
instead of void, thus making it possible to make calls
to the endLoggerMehod for the requestLogger end method.
Issue : WRLGS-13

index.d.ts

@@ -21,6 +21,17 @@ interface LogDictionary {
 }
 
 declare module 'werelogs' {
+
+    class EndLogger {
+        constructor(reqLogger: RequestLogger);
+        trace(msg: string, data?: LogDictionary): void;
+        debug(msg: string, data?: LogDictionary): void;
+        info(msg: string, data?: LogDictionary): void;
+        warn(msg: string, data?: LogDictionary): void;
+        error(msg: string, data?: LogDictionary): void;
+        fatal(msg: string, data?: LogDictionary): void;
+    }
+
     export class RequestLogger {
         constructor(
             logger: any,
@@ -38,6 +49,7 @@ declare module 'werelogs' {
         warn(msg: string, data?: LogDictionary): void;
         error(msg: string, data?: LogDictionary): void;
         fatal(msg: string, data?: LogDictionary): void;
+        end(): EndLogger;
         end(msg: string, data?: LogDictionary): void;
         errorEnd(msg: string, data?:LogDictionary): void;
     }

lib/RequestLogger.js

@@ -356,10 +356,10 @@ class RequestLogger {
      *                          for the log entry. This is how to provide
      *                          metadata for a specific log entry.
      *
-     * @returns {undefined}
+     * @returns {EndLogger|undefined}
      */
     end(msg, data) {
-        if (msg === undefined && data === undefined) {
+        if(msg===undefined && data===undefined) {
             return this.endLogger;
         }
         return this.log(this.endLevel, msg, data, true);