Drop netstandard1.4 and stop testing on end-of-life versions of .NET Core

[jnm2]

Related to #3320.

The .NET Standard 1.4 build is gone and the .NET Standard 2.0 build is no longer tested on .NET Core 2.0 which is out of support. Instead, it is tested on .NET Core 2.1, 2.2, and 3.0.

[jnm2]

@rprouse Did you remove the Travis validation build, or is Travis maybe not responding to webhooks right now? I started getting only four checks in the last few updates to this PR, but I can start builds manually.

[jnm2]

I actually cannot figure out how to get Ubuntu on Travis to work without a large amount of further effort.

Tool 'cake.tool' (version '0.35.0') was successfully installed.
dotnet-cake: command not found

@rprouse Can you confirm whether we are dropping Travis? If so, I may as well delete the yaml because it won't run in its current state in this branch.

[CharliePoole]

I use the cake tool for my Travis builds of TestCentric. My script allows for the fact that the tool is installed in a hidden subdirectory of your home directory.

See... https://github.com/TestCentric/testcentric-gui/blob/master/.travis.yml#L18

[jnm2]

That's the same line I started with, I think. Can you see a difference, excluding the latest commit?

[CharliePoole]

Looks the same to me except for versions.

…

On Tue, Oct 8, 2019 at 12:45 PM Joseph Musser ***@***.***> wrote: That's the same line I started with, I think. Can you see a difference, excluding the latest commit? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#3383?email_source=notifications&email_token=AAUN7BNWKCWCCLUCOXLUH4DQNRQFRA5CNFSM4I3TM4CKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEATXQGA#issuecomment-539457560>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAUN7BI532VLIQBOGU72BZ3QNRQFRANCNFSM4I3TM4CA> .

[rprouse]

I removed Travis as a required build, but I don't think I removed it completely. I'm not sure why it isn't showing up. I'd be fine with dropping it though since we are building Linux on Azure DevOps and that has been much more reliable than Travis.

[rprouse]

LGTM

[jnm2]

@rprouse I deleted the Travis file like I mentioned above because leaving it alone would have still left it broken, but I can do something else if you prefer!