tree 4730aadf4bab739a5964ace08de292601d85fa48
parent 324dcd8c9d44d4000e83a4fefc347cc727617a46
author Gary Miguel <garymm@google.com> 1547258405 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1547581109 +0000

[doc_checker] Ignore files that start with '._'.

MacOS creates these files and they're not actually Markdown.
Before this, running this tool on my machine resulted in errors like:
Unhandled exception:
FileSystemException: Failed to decode data using encoding 'utf-8', path = '...docs/development/languages/dart/._mods.md'

Also update the README.md.

Test: Rebuilt and ran the tool.
Change-Id: I5ae5f11222fbf2a3f0b9aa4a838e5b916152f9f0