Exception on windows with non-ascii character username

[liuxingbaoyu]

lerna ERR! yarn install --mutex network:42424 --non-interactive --no-lockfile --ignore-engines stderr:
internal/modules/cjs/loader.js:969
    throw err;
    ^

Error: Cannot find module 'C:\Users\娴佹槦鏆撮洦\.yarn\bin\yarn.js'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:966:17)
    at Function.Module._load (internal/modules/cjs/loader.js:859:27)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
    at internal/main/run_main_module.js:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

I will open a pr later.