remove stale appveyor config (#1894)

diff --git a/appveyor.yml b/appveyor.yml
deleted file mode 100644
index aae5107..0000000
--- a/appveyor.yml
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
-# for details. All rights reserved. Use of this source code is governed by a
-# BSD-style license that can be found in the LICENSE file.
-
-branches:
-  only:
-    - dev
-
-install:
-  - ps: wget https://storage.googleapis.com/dart-archive/channels/stable/release/latest/sdk/dartsdk-windows-x64-release.zip -OutFile dart-sdk.zip
-  - cmd: echo "Unzipping dart-sdk..."
-  - cmd: 7z x dart-sdk.zip -o"C:\tools" -y > nul
-  - set PATH=%PATH%;C:\tools\dart-sdk\bin
-  - set PATH=%PATH%;%APPDATA%\Pub\Cache\bin
-  - cmd: dart --version
-  - pub get
-
-build: off
-
-test_script:
-  - pub run test -j1
-# using pub run pending resolution of https://github.com/dart-lang/linter/issues/1104  
-#  - dart test\all.dart
diff --git a/doc/RELEASING.md b/doc/RELEASING.md
index 51434a3..58a4bb8 100644
--- a/doc/RELEASING.md
+++ b/doc/RELEASING.md
@@ -11,10 +11,9 @@
 
 ## Doing the Push
 
-First, make sure travis and appveyor are GREEN.
+First, make sure travis is GREEN.
 
 [![Build Status](https://travis-ci.org/dart-lang/linter.svg)](https://travis-ci.org/dart-lang/linter)
-[![Build status](https://ci.appveyor.com/api/projects/status/3a2437l58uhmvckm/branch/master?svg=true)](https://ci.appveyor.com/project/pq/linter/branch/master)
 
 All clear?  Then: