ui: lowercase "no username" warning

mercurial/ui.py

@@ -409,7 +409,7 b' class ui(object):'
         if user is None and not self.interactive():
             try:
                 user = '%s@%s' % (util.getuser(), socket.getfqdn())
-                self.warn(_("No username found, using '%s' instead\n") % user)
+                self.warn(_("no username found, using '%s' instead\n") % user)
             except KeyError:
                 pass
         if not user:

tests/test-committer.t

@@ -53,7 +53,7 b''
   [255]
   $ rm .hg/hgrc
   $ hg commit -m commit-1 2>&1
-  No username found, using '[^']*' instead (re)
+  no username found, using '[^']*' instead (re)
 
   $ echo space > asdf
   $ hg commit -u ' ' -m commit-1