Uncanary r20b, update changelog.

Test: ./checkbuild.py && ./run_tests.py
Bug: None
Change-Id: I3fc519a266e7343070eaf21334311448df18eacf
diff --git a/docs/changelogs/Changelog-r20.md b/docs/changelogs/Changelog-r20.md
index e00f4cb..624fe24 100644
--- a/docs/changelogs/Changelog-r20.md
+++ b/docs/changelogs/Changelog-r20.md
@@ -18,6 +18,10 @@
    August 2019. Start porting now to avoid surprises when the time comes. For
    more information, see [this blog post](https://android-developers.googleblog.com/2017/12/improving-app-security-and-performance.html).
 
+## r20b
+
+ * Fix for CVE-2019-2212, out of bounds buffer read in `std::random`.
+
 ## Changes
 
  * Updated Clang to r346389c.
diff --git a/ndk/config.py b/ndk/config.py
index 82ee15f..5266e27 100644
--- a/ndk/config.py
+++ b/ndk/config.py
@@ -6,7 +6,7 @@
 hotfix_str = chr(ord('a') + hotfix) if hotfix else ''
 beta = 0
 beta_str = '-beta{}'.format(beta) if beta > 0 else ''
-canary = True
+canary = False
 canary_str = '-canary' if canary else ''
 release = 'r{}{}{}{}'.format(major, hotfix_str, beta_str, canary_str)
 if __name__ == '__main__':