Log Message:
yarn: updated to 1.15.2

1.15.2:
The 1.15.1 doesn't exist due to a release hiccup.
Reverts a behavior causing boggus interactions between PowerShell and yarn global
Fixes a bug where non-zero exit codes were converted to a generic 1 when running \ 
yarn run
Fixes production / development reporting when running yarn audit

1.15.0
Removes --scripts-prepend-node-path as Yarn's default behavior makes this obsolete
Fixes the advisory link printed by yarn audit
Fixes npm_config_ environment variable parsing to support those prefixed with \ 
underscore (ex: _auth)
Fixes yarn upgrade --latest for dependencies using > or >= range specifier
Fixes --modules-folder handling in several places (ex: yarn check now respects \ 
--modules-folder)
Removes rootModuleFolders (internal variable which wasn't used anywhere)
Adds support for setting global-folder from .yarnrc files
Makes yarn version cancellable via ctrl-c or empty string
Adds support for yarn policies set-version berry
Fixes yarn upgrade --scope when using exotic (github) dependencies
Fixes occasionally mismatching upper/lowecases of drive letters in win32 pnp check
Fixes the error reporting for non-HTTP network errors (such as invalid certificates)
Changes the location where the --require ./.pnp.js flag gets added into \ 
NODE_OPTIONS: now at the front (bis)
Packages won't be auto-unplugged anymore if ignore-scripts is set in the yarnrc file