Currency: Add "yuan" as alias for Chinese Yuan

[moollaza]

Problem

The word yuan should exist as an alias for "Chinese Yuan" (which seems to be the most popular Peso) in currencyNames.txt.

From user feedback and unanswered query data, we can see that this is something we need.

This issue would be perfect for a newcomer who hasn't yet contributed to DuckDuckHack!

Solution

1. Add 2 or 3 tests to t/Currency.t
   • e.g. 1 yuan to usd
2. Add the aliases in currencyNames.txt
3. Verify tests pass by running duckpan test currency
4. Send Pull Request

People to notify

@pjhampton

Get Started

• [x] 1) Claim this issue by commenting below
• [x] 2) Review our Contributing Guide
• [x] 3) Set up your development environment, and fork this repository
• [x] 4) Create a Pull Request

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Instant Answer Page: https://duck.co/ia/view/currency

[adityatandon007]

@moollaza I would like to try

[pjhampton]

Thanks @adityatandon007 💙 💛 💜