Your requirements could not be resolved to an installable set of packages

Hi,

The composer says, that I cannot install the package because it requires Guzzlehttp/Guzzle v 6.1.1.
`eboost/unoconv dev-master requires guzzlehttp/guzzle 6.1.1 -> satisfiable by guzzlehttp/guzzle[6.1.1]`

Is it possible to update the composer.json to allow higher versions of Guzzle?

Thanks