ncu-ci flags will fail silently if no value is passed #393
Description
$ ncu-ci --copy url https://ci.nodejs.org/job/node-test-pull-request/29714/
# Command didn't run, nothing copied to clipboard, process exited with 0
$ ncu-ci --markdown url https://ci.nodejs.org/job/node-test-pull-request/29714/
# Command didn't run, no error message explainint to the user they should use `--markdown <file>`
$ ncu-ci --markdown foo.md url https://ci.nodejs.org/job/node-test-pull-request/29714/
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[1/1] Running PR: 29714
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✔ Build data downloaded
✔ Data downloaded
----------------------------------- Summary ------------------------------------
Result FAILURE
URL https://ci.nodejs.org/job/node-test-pull-request/29714/
Source https://github.com/nodejs/node/pull/32116/
Commit [0f38b8d45bd1] deps: patch V8 to run on Xcode 8
Date 2020-03-10 17:04:14 -0700
Author Matheus Marchini <mmarchini@netflix.com>
----------------------- ubuntu1804_sharedlibs_debug_x64 ------------------------
...
--------------------------------- Other builds ---------------------------------
Unstable https://ci.nodejs.org/job/node-test-commit-linux/33387/
Unstable https://ci.nodejs.org/job/node-test-commit-osx/32540/
Unstable https://ci.nodejs.org/job/node-test-commit-arm/29944/
Unstable https://ci.nodejs.org/job/node-test-commit-windows-fanned/34549/
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Written markdown to foo.md