bisect-kit: update dianoser after chromeos and android bisectors change

BUG=chromium:827092
TEST=dianose_cros_autotest.py

Change-Id: I6ff954f6693b61dc2a1ec7aefad9bc5fc5bc2ebb
Reviewed-on: https://chromium-review.googlesource.com/1158308
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Chung-yih Wang <cywang@chromium.org>
diff --git a/bisect_cros_repo.py b/bisect_cros_repo.py
index 896fe5e..549ddcb 100755
--- a/bisect_cros_repo.py
+++ b/bisect_cros_repo.py
@@ -6,8 +6,9 @@
 """ChromeOS bisector to bisect local build commits.
 
 Example:
-  $ ./bisect_cros_repo.py init --old rev1 --new rev2 \
-      --chromeos_root ~/chromiumos
+  $ ./bisect_cros_repo.py init --old rev1 --new rev2 \\
+      --chromeos_root ~/chromiumos \\
+      --chromeos_repo_mirror_dir $CHROMEOS_REPO_MIRROR_DIR
   $ ./bisect_cros_repo.py config switch ./switch_cros_localbuild.py
   $ ./bisect_cros_repo.py config eval ./eval-manually.sh
   $ ./bisect_cros_repo.py run