Add migration to remove 'exists'. (#199)

Update version to 1.2.2.

edxval/migrations/0015_remove_thirdpartytranscriptcredentialsstate_exists.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.25 on 2019-12-06 21:18
+from __future__ import unicode_literals
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('edxval', '0014_transcript_credentials_state_retype_exists'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='thirdpartytranscriptcredentialsstate',
+            name='exists',
+        ),
+    ]

setup.py

@@ -46,7 +46,7 @@ def load_requirements(*requirements_paths):
     return list(requirements)
 
 
-VERSION = '1.2.1'
+VERSION = '1.2.2'
 
 if sys.argv[-1] == 'tag':
     print("Tagging the version on github:")