update travis to 17.10 and latest dotnet.

Author: danwalmsley

.travis.yml

@@ -2,7 +2,7 @@ sudo: required
 language: csharp
 os:
   - linux
-dist: trusty
+dist: artful
 
 script:
   - ./install-latest-dotnet.sh

install-latest-dotnet.sh

@@ -1,8 +1,11 @@
 #!/usr/bin/env bash
 
-sudo apt-get install -y libunwind8 libunwind8-dev gettext libicu-dev liblttng-ust-dev libcurl4-openssl-dev libssl-dev uuid-dev unzip
-wget https://download.microsoft.com/download/1/B/4/1B4DE605-8378-47A5-B01B-2C79D6C55519/dotnet-sdk-2.0.0-linux-x64.tar.gz
-mkdir ~/dotnet
-tar zxf dotnet-sdk-2.0.0-linux-x64.tar.gz -C ~/dotnet
-sudo ln -s ~/dotnet/dotnet /usr/bin/
+curl https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.gpg
+sudo mv microsoft.gpg /etc/apt/trusted.gpg.d/microsoft.gpg
+sudo sh -c 'echo "deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-artful-prod artful main" > /etc/apt/sources.list.d/dotnetdev.list'
+
+sudo apt-get install apt-transport-https
+sudo apt-get update
+sudo apt-get install dotnet-sdk-2.1.4
+
 dotnet --info