Use the latest version of bolt in tests

.appveyor.yml

@@ -15,7 +15,7 @@ branches:
 install:
 - ps: Install-Product node $env:nodejs_version $env:platform
 - set PATH=%APPDATA%\npm;%PATH%
-- npm i -g bolt@0.20.1
+- npm i -g bolt@0.21.2
 - if not exist "node_modules" mkdir node_modules
 - ps: Remove-Item node_modules -Recurse -Force
 - bolt

ci/docker.sh

@@ -5,7 +5,7 @@ set -e
 NODE_INSTALLER="$1"
 
 npm i -g yarn
-npm i -g bolt@0.20.1
+npm i -g bolt@0.21.2
 
 cd /code