Update dotnet obtain script for travis
Update dotnet obtain script for travis

treziac/confluent-kafka-dotnet,MrGlenThomas/confluent-kafka-dotnet,MrGlenThomas/confluent-kafka-dotnet,ah-/rdkafka-dotnet,bjornicus/confluent-kafka-dotnet,MaximGurschi/rdkafka-dotnet,bjornicus/confluent-kafka-dotnet,treziac/confluent-kafka-dotnet