Make rating a decimal field

bookwyrm/migrations/0053_auto_20210319_1913.py

@@ -0,0 +1,20 @@
+# Generated by Django 3.1.6 on 2021-03-19 19:13
+
+import bookwyrm.models.fields
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('bookwyrm', '0052_user_show_goal'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='review',
+            name='rating',
+            field=bookwyrm.models.fields.DecimalField(blank=True, decimal_places=2, default=None, max_digits=3, null=True, validators=[django.core.validators.MinValueValidator(1), django.core.validators.MaxValueValidator(5)]),
+        ),
+    ]