installation with yarn2.

[DianaSuvorova]

1. Readme needs to be updated that with yarn2 correct command is yarn dlx jazelle not yarn global add jazelle
2. yarn dlx jazelle throws an error while appears to be working correctly:

yarn dlx jazelle
➤ YN0000: ┌ Resolution step
➤ YN0000: └ Completed in 1s 654ms
➤ YN0000: ┌ Fetch step
➤ YN0000: └ Completed
➤ YN0000: ┌ Link step
➤ YN0000: └ Completed in 0s 222ms
➤ YN0000: ┌ Generating workspace-deps.txt
➤ YN0000: └ Completed
➤ YN0000: Done in 1s 926ms

/private/var/folders/fz/tds93qq164s2q0sv2zgbd7k40000gn/T/xfs-24c61363/dlx-30285/.yarn/unplugged/jazelle-npm-0.0.0-standalone.32-canary-0ecae71df3/node_modules/jazelle/bin/bootstrap.sh:3
realpath() {
           ^

SyntaxError: Unexpected token '{'
    at wrapSafe (internal/modules/cjs/loader.js:915:16)
    at Module._compile (internal/modules/cjs/loader.js:963:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1027:10)
    at Module.load (internal/modules/cjs/loader.js:863:32)
    at Function.external_module_.Module._load (/private/var/folders/fz/tds93qq164s2q0sv2zgbd7k40000gn/T/xfs-24c61363/dlx-30285/.pnp.js:4902:14)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:60:12)
    at internal/main/run_main_module.js:17:47