Installation fails due to `postinstall` command

[jacobmllr95]

The installation of eslint-plugin-jest v22.6.0 fails due to the postinstall command introduced in #257 which tries to compile files with babel.

[4/4] Building fresh packages...
error /root/project/bootstrap-vue/node_modules/eslint-plugin-jest: Command failed.
Exit code: 1
Command: yarn build
Arguments: 
Directory: /root/project/bootstrap-vue/node_modules/eslint-plugin-jest
Output:
yarn run v1.13.0
$ babel --extensions .js,.ts src --out-dir lib
/bin/sh: 1: babel: not found
error Command failed with exit code 127.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
Exited with code 1

[jacobmllr95]

Duplicate of #263.

[simoneb]

same here. our CI started failing right away