Modify maximum field length

Artist.genre and Track.name had maximum lengths that were not long enough, now increased.

spotifyvis/migrations/0002_auto_20180608_2002.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.0.5 on 2018-06-09 00:02
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('spotifyvis', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='artist',
+            name='genre',
+            field=models.CharField(max_length=30),
+        ),
+    ]

spotifyvis/migrations/0003_auto_20180608_2007.py

@@ -0,0 +1,18 @@
+# Generated by Django 2.0.5 on 2018-06-09 00:07
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('spotifyvis', '0002_auto_20180608_2002'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='track',
+            name='name',
+            field=models.CharField(max_length=150),
+        ),
+    ]