Add 2.0.0 to AppVeyor builds (#1530)

* Add 2.0.0 to AppVeyor builds

* Install libunwind dependency on Linux

Author: rjmholt

.travis.yml

@@ -13,6 +13,7 @@ osx_image: xcode8.3
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
       nvm install v6.0.0;
+      sudo apt-get install libunwind8;
     fi
 install:
   - git clone https://github.com/PowerShell/PowerShellEditorServices.git ../PowerShellEditorServices

appveyor.yml

@@ -6,7 +6,7 @@ skip_tags: true
 branches:
   only:
   - master
-  - develop
+  - 2.0.0
 
 environment:
   DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true  # Don't download unneeded packages