Use the @SerializedName annotation for ISO 3166-1

Our Java class needs to match the input JSON structure exactly, but
we can't use "3166-1" as a variable name so we tell GSON to use the
name "3166-1" when deserializing to countries.

src/main/java/org/cgiar/cgspace/ctasks/CountriesVocabulary.java

@@ -20,9 +20,10 @@ package org.cgiar.cgspace.ctasks;
 
 import javax.annotation.Nullable;
 import java.util.List;
+import com.google.gson.annotations.SerializedName;
 
 public class CountriesVocabulary {
-    List<Country> countries;            //required
+    @SerializedName("3166-1") List<Country> countries;            //required
 
     class Country {
         private String name;            //required

src/main/java/org/cgiar/cgspace/ctasks/CountryCodeTagger.java

@@ -82,7 +82,7 @@ public class CountryCodeTagger extends AbstractCurationTask
                 System.out.println(isocodesCountriesJson.getClass());
                 System.out.println(cgspaceCountriesJson.getClass());
 
-                for (CountriesVocabulary.Country country : cgspaceCountriesJson.countries) {
+                for (CountriesVocabulary.Country country : isocodesCountriesJson.countries) {
                     System.out.println(country.getName());
                 }