Add postal code in Taiwan

Fix #753.

Author: xfq

questions/qa-address-formats.en.html

@@ -134,7 +134,7 @@ <h3>Length and format</h3>
 </li>
 <li><p><strong>South America:</strong> Format patterns vary significantly. Brazil uses an 8-digit system with a hyphen (e.g., <b class="highlight">70150-900</b>). Argentina's 8-character alphanumeric code is written as a single string without separators (e.g., <b class="highlight">C1070AAB</b>). Colombia and Ecuador use 6-digit systems written as continuous numbers.</p>
 </li>
-<li><p><strong>Asia:</strong> Mainland China uses a 6-digit continuous numeric code without separators. Japan uses a 7-digit system with a hyphen after the first 3 digits (e.g., <b class="highlight">100-0001</b>). South Korea's 5-digit system is written without separators, while India uses a 6-digit PIN code system with no separators.</p>
+<li><p><strong>Asia:</strong> Mainland China uses a 6-digit continuous numeric code without separators. Taiwan uses a "3+3" system with 6-or-3-digit continuous numeric codes without separators: the 6-digit detailed code or the first 3 digits as a brief code. It replaced the previous "3+2" system (5-or-3-digit codes) in 2020, with both systems running in parallel until the old system was retired in 2024. Japan uses a 7-digit system with a hyphen after the first 3 digits (e.g., <b class="highlight">100-0001</b>). South Korea uses a 5-digit system without separators, and India uses a 6-digit PIN code system without separators.</p>
 </li>
 <li><p><strong>Africa:</strong> Nigeria and Ghana use 6-digit systems without separators, while South Africa uses a 4-digit code with no separators.</p>
 </li>