Set max length for profile description

Closes #615

website/members/migrations/0020_max_length_on_profile.py

+# Generated by Django 2.0.2 on 2018-03-20 16:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('members', '0019_delete_becomeamemberdocument'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='profile',
+            name='profile_description',
+            field=models.TextField(blank=True, help_text='Text to display on your profile', max_length=4096, null=True, verbose_name='Profile text'),
+        ),
+    ]

website/members/models.py

@@ -286,6 +286,7 @@ class Profile(models.Model):
         help_text=_('Text to display on your profile'),
         blank=True,
         null=True,
+        max_length=4096,
     )
 
     initials = models.CharField(