Update .travis.yml

Author: hazzik

.travis.yml

@@ -13,8 +13,6 @@ env:
   - DB=MySQL CONNECTION_STRING="Server=127.0.0.1;Uid=root;Database=nhibernate;Old Guids=True;"   
   - DB=SQLite 
 before_install:
-  - curl https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add -
-  - curl https://packages.microsoft.com/config/ubuntu/18.04/prod.list | sudo tee /etc/apt/sources.list.d/microsoft.list
   - sudo apt-get update -qq
   - sudo apt-get install -y powershell 
   - |-