Add oppressive language presubmit

...and change a couple of links in the readme to remove references to
"master".

BUG=b:162024466
TEST=try to upload a CL with a blocked term; check links work

Change-Id: I5710aa3c8cf7cd5adeb1377f78f3ea3e878ef94d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/usi-test/+/2575557
Tested-by: Harry Cutts <hcutts@chromium.org>
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Sean O'Brien <seobrien@chromium.org>
diff --git a/README.md b/README.md
index 70daedc..a88ecf2 100644
--- a/README.md
+++ b/README.md
@@ -123,6 +123,6 @@
 $ usi-test diagnostic 52 7 --preamble 2 --crc 3
 ```
 
-[command prompt]: https://chromium.googlesource.com/chromiumos/docs/+/master/developer_mode.md#shell
-[cros flash]: https://chromium.googlesource.com/chromiumos/docs/+/master/cros_flash.md
+[command prompt]: https://chromium.googlesource.com/chromiumos/docs/+/HEAD/developer_mode.md#shell
+[cros flash]: https://chromium.googlesource.com/chromiumos/docs/+/HEAD/cros_flash.md
 [usi]: https://universalstylus.org/
diff --git a/unblocked_terms.txt b/unblocked_terms.txt
new file mode 100644
index 0000000..7bc8fe3
--- /dev/null
+++ b/unblocked_terms.txt
@@ -0,0 +1,36 @@
+# Don't delete this file if you want to keep keyword_check enabled even if it's
+# empty.
+#
+# See repohooks/README.md for more details.
+
+# black.?hat
+# black.?list
+# build.?cop
+# crazy
+# cripple
+# dummy
+# first.?class.?citizen
+# grandfathered
+# gr[ae]y.?hat
+# gr[ae]y.?list
+# insane
+\bhe\b
+\bshe\b
+\bhim\b
+\bher\b
+\bhis\b
+\bhers\b
+man.?in.?the.?middle
+# master
+mitm
+native
+# red.?line
+# rtfm
+sane
+sanity
+# slave
+# white.?glove
+# white.?hat
+# white.?label
+# white.?list
+# wtf