add badge and specify dotnet sdk (#5)

Author: TylerLeonhardt

.travis.yml

@@ -1,14 +1,18 @@
-language: generic
+language: csharp
 
 matrix:
   include:
     - os: osx
+      dotnet: 2.1.4
+      mono: none
       osx_image: xcode9.1
       before_install:
         - brew update
         - brew tap caskroom/cask
         - brew cask install powershell
     - os: linux
+      dotnet: 2.1.4
+      mono: none
       dist: trusty
       sudo: required
       addons:

README.md

@@ -1,6 +1,7 @@
 # PowerShell-IoT
 
 [![Build status](https://ci.appveyor.com/api/projects/status/ipvxu77rxb5ou8gb?svg=true)](https://ci.appveyor.com/project/PowerShell/powershell-iot)
+[![Travis](https://img.shields.io/travis/rust-lang/rust.svg?logo=travis)](https://travis-ci.com/PowerShell/PowerShell-IoT)
 
 Docs will change...