Last chunk can be twice as big as the chunk size

[nerg4l]

When using Resumable.js, Flow.js, or simple-upload.js the last chunk can be bigger than the chunkSize parameter. Max twice as big but it is not defined in any of the mentioned libraries' documentation.

At the moment OneBasedRequestBodyRange component has the following check:

https://github.com/LaraCrafts/laravel-chunk-uploader/blob/029d3253c0fa3c11e313b338efaf033d80bdb14f/src/Range/OneBasedRequestBodyRange.php#L47

This makes it invalid without setting forceChunkSize.

A configuration should be introduced for forceChunkSize and the mentioned validation should compare totalSize with (numberOfChunks + 1) * chunkSize.

For now I will add a note in the README to use forceChunkSize option when using the above mentioned libraries.