feat(people): Add nationality and residence fields

See #1

people/migrations/0010_add_country_fields.py

@@ -0,0 +1,24 @@
+# Generated by Django 2.2.10 on 2020-02-24 08:16
+
+from django.db import migrations
+import django_countries.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('people', '0009_add_first_person_fields'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='person',
+            name='country_of_residence',
+            field=django_countries.fields.CountryField(blank=True, max_length=2, null=True),
+        ),
+        migrations.AddField(
+            model_name='person',
+            name='nationality',
+            field=django_countries.fields.CountryField(blank=True, max_length=2, null=True),
+        ),
+    ]