Chore: disable GitHub Linguist detection for tests files

[sabertazimi]

It makes TypeScript become the top language.

[johnnyreilly]

Could you provide some more information please? I don't understand the intent of this PR.

[sabertazimi]

Could you provide some more information please? I don't understand the intent of this PR.

You can refer to the repo GitHub Linguist for GitHub language detection service.
And you can refer to the forked repo WebPRs/ts-loader for viewing live demo.

When you viewing original ts-loader repo in browser, GitHub marks JavaScript as top language of ts-loader repo
via GitHub Linguist service.
But actually, all source files in ts-loader repo are written in TypeScript.
Most JavaScript files are located in directory test/.

GitHub allows you to change detection strategy in .gitattributes file.
After ignoring detection for files in directory test/, GtiHub marks TypeScript as top language of ts-loader repo.

[sabertazimi]

Only ts-loader is marked as a JavaScript repo. But actually, it's a TypeScript repo (due to all source files in directory src/ are written in TypeScript).

[johnnyreilly]

Nice!

[sabertazimi]

It works.