Just spent an hour trying to make it work (including re-compiling) with the jsruntime.

`Error: JavaScript modules found but libperry_jsruntime.a not found. Build it with: cargo build --release -p perry-jsruntime`

Turns out jsruntime was removed one week ago, but the error messages probably not have been updated as they should.

https://github.com/PerryTS/perry/commit/848339fa4ee4b00a53f5...