Merge pull request #597 from PowerShell/ci-cache

Enable caching on CI machines

.travis.yml

@@ -1,6 +1,10 @@
 language: cpp
 sudo: required
 dist: trusty
+cache:
+  apt: true
+  directories:
+    - $HOME/.nuget
 git:
   submodules: false
 before_install:

appveyor.yml

@@ -2,6 +2,10 @@ environment:
   priv_key:
     secure: <encryped-value>
 
+cache:
+  - '%HOME%\.nuget'
+  - '%LocalAppData%\Microsoft\dotnet'
+
 notifications:
   - provider: Slack
     incoming_webhook: