added - query by ip address

Author: seventhmoon

library/src/main/java/com/androidfung/geoip/IpApiService.java

@@ -4,6 +4,7 @@
 
 import retrofit2.Call;
 import retrofit2.http.GET;
+import retrofit2.http.Path;
 
 /**
  * Created by funglam on 3/16/17.
@@ -14,5 +15,5 @@ public interface IpApiService {
     Call<GeoIpResponseModel> getGeoIp();
 
     @GET("json/{ipAddress}")
-    Call<GeoIpResponseModel> getGeoIp(String ipAddress);
+    Call<GeoIpResponseModel> getGeoIp(@Path("ipAddress") String ipAddress);
 }