Add license_note am: 9123a0191f

Original change: https://android-review.googlesource.com/c/platform/external/google-fonts/source-sans-pro/+/2011996

Change-Id: Id96a28589d73987f01759023b89a1c53794d20ac
diff --git a/METADATA b/METADATA
index a0b1399..c347fe2 100644
--- a/METADATA
+++ b/METADATA
@@ -17,5 +17,6 @@
   }
   version: "94dff3eaa9301b6640cccc63c56d6ff33d82882c"
   last_upgrade_date { year: 2018 month: 12 day: 27 }
+  license_note: "contains OFL fonts"
   license_type: BY_EXCEPTION_ONLY
 }