Change dotnet version in travis, per https://travis-ci.community/t/net-core-3-0-100-builds-are-failing-not-possible-to-find-compatible-framework-version/5665/2
Change dotnet version in travis, per https://travis-ci.community/t/net-core-3-0-100-builds-are-failing-not-possible-to-find-compatible-framework-version/5665/2

toddams/RazorLight,toddams/RazorLight