fix boldness of Node12 version

Author: Dave Conway-Jones

docs/faq/node-versions.md

@@ -14,7 +14,7 @@ Version | Support Level | Notes
  9.x  | *Unsupported* |
  **10.x**  | **Recommended** |
   11.x  | *Unsupported* |
-  12.x  | **Supported** |  
+  **12.x**  | **Supported** |  
 
 
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