Wire up selector for updating a workspace user's role

atst/forms/update_member.py

@@ -0,0 +1,16 @@
+from flask_wtf import Form
+from wtforms.fields import StringField
+from wtforms.fields.html5 import EmailField
+from wtforms.validators import Required, Email, Length
+
+from atst.forms.validators import IsNumber
+from atst.forms.fields import SelectField
+
+from .data import WORKSPACE_ROLES
+
+
+class UpdateMemberForm(Form):
+
+    workspace_role = SelectField(
+        "Workspace Role", choices=WORKSPACE_ROLES, validators=[Required()], default=""
+    )