Update deps, fix linux compile and remove now useless transmute

[nik012003]

The first commit fixes #18 and #20 by removing the depracated usage() and usage_page() calls and updates all the dependecies. The second commit just removes the unsafe transumte, by using to_le_bytes() which has been available since rust 1.32

EDIT: this has only been tested on linux, please check if it breaks on other platforms

[Codetector1374]

Tested compiles / works fine on windows too. Merging