fix: added hashcode guava google in geolocation

Author: jeancarlosgarcia

build.gradle

@@ -17,6 +17,7 @@ dependencies {
     // compile 'org.apache.httpcomponents:httpclient:4.5.2'
     compile 'com.squareup.okhttp3:okhttp:3.12.0'
     compile group: 'com.google.code.gson', name: 'gson', version: '2.7'
+    implementation 'com.google.guava:guava:28.1-jre'
 
     testCompile group: 'junit', name: 'junit', version: '4.12'
 }

src/main/java/com/osrm/client/GeoLocation.java

@@ -1,5 +1,7 @@
 package com.osrm.client;
 
+import com.google.common.base.Objects;
+
 public class GeoLocation {
     private final Double latitude;
     private final Double longitude;
@@ -23,7 +25,7 @@ public String getLatLongString() {
 
     @Override
     public int hashCode() {
-        return latitude.hashCode() + longitude.hashCode();
+        return Objects.hashCode(this.getLatitude(), this.getLongitude());
     }
 
     @Override