fix(jest): fix "jest/globals" is unknown (#52)

'jest/globals' env now is unknown for eslint. Used 'jest' instead like it was suggested here jest-community/eslint-plugin-jest#44 (comment)

Author: binchik

packages/eslint-config/jest.js

@@ -1,7 +1,7 @@
 module.exports = {
   plugins: ['jest'],
   env: {
-    'jest/globals': true,
+    jest: true,
   },
   rules: {
     'max-nested-callbacks': 'off',