Increase number of mirrors allowed in the graph.

Needs a better fix.

apt-panopticon-report-email-web.lua

@@ -512,6 +512,12 @@ local colours =
     '00880080',
     '00088080',
     '00008880',
+    '80000080',
+    '08000080',
+    '00800080',
+    '00080080',
+    '00008080',
+    '00000880',
 }
 local g = {}
 local count = 0