migrate library version and name to BuildConfig interface

Author: lbalmaceda

src/main/java/com/auth0/BuildConfig.java

@@ -0,0 +1,6 @@
+package com.auth0;
+
+public interface BuildConfig {
+    String NAME = "auth0-java";
+    String VERSION = "1.0.0";
+}

src/main/java/com/auth0/net/TelemetryInterceptor.java

@@ -1,5 +1,6 @@
 package com.auth0.net;
 
+import com.auth0.BuildConfig;
 import okhttp3.Interceptor;
 import okhttp3.Response;
 
@@ -11,7 +12,7 @@ public class TelemetryInterceptor implements Interceptor {
     private boolean enabled;
 
     public TelemetryInterceptor() {
-        this(new Telemetry("auth0-java", "1.0"));
+        this(new Telemetry(BuildConfig.NAME, BuildConfig.VERSION));
     }
 
     TelemetryInterceptor(Telemetry telemetry) {