Add People's Republic of China as alternate country name

[jwalgran]

Fixes parse errors when contributing lists that use this name.

Overview

Brief description of what this PR does, and why it is needed.

Connects #868

Testing Instructions

This assumes the database has been reset with ./scripts/resetdb

• Check out the develop branch.
• Log in as c2@example.com
• Browse http://localhost:6543/contribute and submit prc-test.csv.zip
• Attempt to parse this file and verify that there are 2 failures

vagrant@vagrant:/vagrant$ ./scripts/manage batch_process --list-id 16 --action parse
Starting vagrant_database_1 ... done
parse: 1 successes
parse: 2 failures

• Check out this branch
• Browse http://localhost:6543/contribute and submit prc-test.csv.zip
• Attempt to parse the file and verify that there are 3 successes

vagrant@vagrant:/vagrant$ ./scripts/manage batch_process --list-id 17 --action parse
Starting vagrant_database_1 ... done
parse: 3 successes

Checklist

• fixup! commits have been squashed
• CI passes after rebase
• CHANGELOG.md updated with summary of features or fixes, following Keep a Changelog guidelines

[kellyi]