Merge pull request #415 from devgateway/fix/OCE-343/number-double-field-type

OCE-343 Fieldtype export does not have Number type

Author: ionutdobre

persistence-mongodb/src/main/java/org/devgateway/ocds/persistence/mongo/excel/FieldType.java

@@ -43,5 +43,7 @@ private FieldType() {
             .add(boolean.class)
             .add(int.class)
             .add(long.class)
+            .add(Double.class)
+            .add(double.class)
             .build();
 }