request() can return non Err errors

[StefanoMagrassi]

Description
In some cases (request aborting?) the request() function seems to return a non-Err error in the Left branch.

In line 131 we use .catch() to catch all errors throwed by the previous fetch call, which should be already transformed in Err objects (ref. line 128).

This seems to not cover all possible cases: the toRequestError() transformation maybe should be moved in the .catch() block...

Current behavior
request() can return TaskEither.Left<Error> when fetch throws error.

Expected behavior
request() should return only TaskEither.Left<Err> when fetch throws error.

Environment:

• OS: All
• Browser: All
• Node/npm version: All
• Typescript version: All