[damned-lies] Add username search field in Role admin

[Claude Paroz <claudep src gnome org>]

commit 4b5986e7146bf3ab6e93802960b72af247aaca5a
Author: Claude Paroz <claude 2xlibre net>
Date:   Mon Dec 18 10:08:14 2017 +0100

    Add username search field in Role admin

 teams/admin.py |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/teams/admin.py b/teams/admin.py
index 34d95c5..ba42285 100644
--- a/teams/admin.py
+++ b/teams/admin.py
@@ -24,7 +24,10 @@ class TeamAdmin(admin.ModelAdmin):
 
 
 class RoleAdmin(admin.ModelAdmin):
-    search_fields = ('person__first_name', 'person__last_name', 'team__description', 'role')
+    search_fields = (
+        'person__first_name', 'person__last_name', 'person__username',
+        'team__description', 'role',
+    )
 
 
 admin.site.register(Team, TeamAdmin)