better email address validation in team invite form

rowers/models.py

@@ -336,10 +336,15 @@ class TeamInvite(models.Model):
 
 class TeamInviteForm(ModelForm):
     user = UserFullnameChoiceField(queryset=User.objects.all(),required=False)
+    email = forms.EmailField(required=False)
     class Meta:
         model = TeamInvite
         fields = ['user','email']
 
+            
+
+        
+
 class TeamRequest(models.Model):
     team = models.ForeignKey(Team)
     user = models.ForeignKey(User,null=True)