Remove duplicate copyright named character entry.

Author: objecthub

Sources/MarkdownKit/HTML/NamedCharacters.swift

@@ -337,7 +337,6 @@ public struct NamedCharacters {
     "∐"              : "\u{02210}",
     "∐"           : "\u{02210}",
     "©"                : "\u{000A9}",
-    "©"                : "\u{000A9}",
     "℗"              : "\u{02117}",
     "&CounterClockwiseContourIntegral;": "\u{02233}",
     "↵"               : "\u{021B5}",
@@ -2171,6 +2170,7 @@ public struct NamedCharacters {
   ]
 
   public static let characterNameMap: [Character : String] = {
+    print("COUNT = \(NamedCharacters.namedCharacterMap.count)")
     var map = [Character : String](minimumCapacity: NamedCharacters.namedCharacterMap.count)
     for (k, v) in NamedCharacters.namedCharacterMap {
       map[v] = k