Update build.yaml to support Cassandra 3.4
Update build.yaml to support Cassandra 3.4
mintsoft/csharp-driver,alprema/csharp-driver,datastax/csharp-driver,maxwellb/csharp-driver,bridgewell/csharp-driver,jorgebay/csharp-driver,trurl123/csharp-driver,maxwellb/csharp-driver,datastax/csharp-driver