[typescript-fetch]: Fix package.json main.

[jgiles]

The "main" and "typings" files are generated under "./dist/src", not
"./dist".

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Description of the PR

Update the "main" and "typings" properties in package.json to match the files actually generated.

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[jgiles]

@macjohnny unrelated to the requests stuff, but I noticed that package.json appears inconsistent with actual generated files locations. I think these were missed in the refactoring that pulled things under the src tree.

cc @TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @nicokoenig (2018/09) @topce (2018/10) @akehir (2019/07)

[macjohnny]

this change should not be necessary, see #3694 (comment)

[macjohnny]

@jgiles can you please post the commands you performed before you ended up with files in /dist/src?
cc @JFCote

[jgiles]

Yeah, it turns out the location change was the result of adding "composite": true to the tsconfig compiler options. That setting is useful for building this generated code as part of a larger project, but I guess it can't be set without adjusting a couple other things.

Possibly a codegen option feature, but out-of-scope for the moment.

[jgiles]

For the record @macjohnny the fix for using "composite": true is to also set "rootDir": "src".