Roman Numerals max out at 3999 (#2094 #2475)

Update exercises/roman-numerals/description.md and tests to support up to 3999.

Co-authored-by: June <[email protected]>
Co-authored-by: Peter Tseng <[email protected]>

Author: 3 people

exercises/roman-numerals/canonical-data.json

@@ -242,6 +242,24 @@
         "number": 1666
       },
       "expected": "MDCLXVI"
+    },
+    {
+      "uuid": "3bc4b41c-c2e6-49d9-9142-420691504336",
+      "description": "3001 is MMMI",
+      "property": "roman",
+      "input": {
+        "number": 3001
+      },
+      "expected": "MMMI"
+    },
+    {
+      "uuid": "4e18e96b-5fbb-43df-a91b-9cb511fe0856",
+      "description": "3999 is MMMCMXCIX",
+      "property": "roman",
+      "input": {
+        "number": 3999
+      },
+      "expected": "MMMCMXCIX"
     }
   ]
 }

exercises/roman-numerals/description.md

@@ -20,7 +20,7 @@ into stone tablets).
  7  => VII
 ```
 
-There is no need to be able to convert numbers larger than about 3000.
+The maximum number supported by this notation is 3,999.
 (The Romans themselves didn't tend to go any higher)
 
 Wikipedia says: Modern Roman numerals ... are written by expressing each