py3: make test-basic.t pass on Python 3

contrib/python3-whitelist

@@ -8,6 +8,7 b' test-annotate.py'
 test-automv.t
 test-backout.t
 test-backwards-remove.t
+test-basic.t
 test-bheads.t
 test-bisect2.t
 test-bookmarks-current.t

tests/test-basic.t

@@ -59,7 +59,7 b' Verify that updating to revision 0 via c'
   $ cat <<EOF > update_to_rev0.py
   > from mercurial import ui, hg, commands
   > myui = ui.ui.load()
-  > repo = hg.repository(myui, path='.')
+  > repo = hg.repository(myui, path=b'.')
   > commands.update(myui, repo, rev=0)
   > EOF
   $ hg up null