Bug 1842198 - [remote] Update hgignore to ignore readme files in puppeteer packages r=Sasha

Depends on D184112

Differential Revision: https://phabricator.services.mozilla.com/D184209

.hgignore

@@ -134,7 +134,9 @@ _OPT\.OBJ/
 ^remote/test/puppeteer/node_modules/
 ^remote/test/puppeteer/package-lock\.json
 ^remote/test/puppeteer/packages/ng-schematics/test/build
+^remote/test/puppeteer/packages/puppeteer/.*/README.md
 ^remote/test/puppeteer/packages/puppeteer-core/src/generated
+^remote/test/puppeteer/packages/puppeteer-core/.*/README.md
 ^remote/test/puppeteer/src/generated
 ^remote/test/puppeteer/test/build
 ^remote/test/puppeteer/test/installation/puppeteer.*\.tgz