Update README.rst for release 0.8.1 (bazel-contrib#1136)

[skip ci]
[ci skip]

README.rst

@@ -34,15 +34,15 @@ Travis   Jenkins
 Announcements
 -------------
 
+December 13, 2017
+  Release `0.8.1 <https://github.com/bazelbuild/rules_go/releases/tag/0.8.1>`_
+  is now available.
 December 6, 2017
   Release `0.8.0 <https://github.com/bazelbuild/rules_go/releases/tag/0.8.0>`_
   is now available.
 November 27, 2017
   Release `0.7.1 <https://github.com/bazelbuild/rules_go/releases/tag/0.7.1>`_
   is now available.
-November 3, 2017
-  Release `0.7.0 <https://github.com/bazelbuild/rules_go/releases/tag/0.7.0>`_
-  is now available.
 
 .. contents::
 
@@ -82,7 +82,7 @@ They currently do not support (in order of importance):
 * coverage
 * test sharding
 
-:Note: The latest version of these rules (0.8.0) requires Bazel ≥ 0.8.0 to work.
+:Note: The latest version of these rules (0.8.1) requires Bazel ≥ 0.8.0 to work.
 
 The ``master`` branch is only guaranteed to work with the latest version of Bazel.
 
@@ -100,8 +100,8 @@ Setup
 
     http_archive(
         name = "io_bazel_rules_go",
-        url = "https://github.com/bazelbuild/rules_go/releases/download/0.8.0/rules_go-0.8.0.tar.gz",
-        sha256 = "8eaf2e62811169d9cf511209153effcb132826cea708b2f75d4dd5f9e57ea2aa",
+        url = "https://github.com/bazelbuild/rules_go/releases/download/0.8.1/rules_go-0.8.1.tar.gz",
+        sha256 = "90bb270d0a92ed5c83558b2797346917c46547f6f7103e648941ecdb6b9d0e72",
     )
     load("@io_bazel_rules_go//go:def.bzl", "go_rules_dependencies", "go_register_toolchains")
     go_rules_dependencies()