Fix Drupal.org packaging script touch .info file

At now _SUBTHEME folder contains SUBTHEME.info file, that seems toched via Drupal.org packaging script touch, because after downloading via Composer I see those contents in it:

name: SUBTHEME
type: theme
description: 'SUBTHEME subtheme'
core: 8.x
base theme: bootstrap4

# Libraries.
libraries-override:
  bootstrap4/global-styling: SUBTHEME/global-styling

# Regions.
regions:
  header: Header
  nav_branding: 'Navigation branding region'
  nav_main: 'Main navigation region'
  nav_additional: 'Additional navigation region (eg search form, social icons, etc)'
  breadcrumb: Breadcrumbs
  content: 'Main content'
  sidebar_first: 'Sidebar first'
  sidebar_second: 'Sidebar second'
  footer: Footer

; Information added by Drupal.org packaging script on 2020-03-28
version = "8.x-1.0-rc5"
core = "8.x"
project = "bootstrap4"
datestamp = "1585405282"

And I got InfoParserException after creating subtheme with error:
Drupal\Core\Extension\InfoParserException: Unable to parse themes/contrib/test2/test2.info.yml Unable to parse at line 24 (near "version = "8.x-1.0-rc5""). in Drupal\Core\Extension\InfoParserDynamic->parse() (line 53 of core/lib/Drupal/Core/Extension/InfoParserDynamic.php).

Seems this is package script for Drupal 7.x modules (old format of .info file), that don't detect that this module is for 8.x.

Solution for this problem, I hope, can be change .info file extension to something else, eg .info._yml, so I will try to fix this via patch.