Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Update bazel-toolchains to 3.1.0

Change-Id: Iea68c8df802120c2ba18e9fdb75c390660f13db4

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 64dd721..5a098db 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -8,11 +8,11 @@
 
 http_archive(
     name = "bazel_toolchains",
-    sha256 = "88e818f9f03628eef609c8429c210ecf265ffe46c2af095f36c7ef8b1855fef5",
-    strip_prefix = "bazel-toolchains-92dd8a7a518a2fb7ba992d47c8b38299fe0be825",
+    sha256 = "726b5423e1c7a3866a3a6d68e7123b4a955e9fcbe912a51e0f737e6dab1d0af2",
+    strip_prefix = "bazel-toolchains-3.1.0",
     urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/archive/92dd8a7a518a2fb7ba992d47c8b38299fe0be825.tar.gz",
-        "https://github.com/bazelbuild/bazel-toolchains/archive/92dd8a7a518a2fb7ba992d47c8b38299fe0be825.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-toolchains/releases/download/3.1.0/bazel-toolchains-3.1.0.tar.gz",
     ],
 )