(Auto)update of wrapped Rust unicode-bidi package version

[Serjio42]

Hello. Thanks for the package!
As I understand from this line of code the version of the Rust unicode-bidi package is frozen (hard-coded).
I wonder if there is any way to automate the update of Rust package (now 0.3.17 is the last version).

To be honest, I have not found any info about the differences between 0.3.15 and 0.3.17 versions, but it looks like the newest will be the best and up-to-date, as Unicode algorithm specs is also evolving.