Remove method uses wrong JS method

[obany]

The library remove method uses unshift, which is for adding to a list.

https://github.com/iotaledger/curl.lib.js/blob/2da1de36123d89b0c7dcababe24f72828bc5f794/src/curl.lib.js#L168

This should be either be shift() if you are trying to remove the current job, or pop() if you are trying to remove the last added item.

[laubsauger]

That's right. Using the unshift-method without parameters just returns the last element of the array which is most likely not the intended behaviour here.