Use regular anchar, performantAnyChar has a bug where it eats one char too many

src/org/org_block_heading.nim

@@ -32,7 +32,7 @@ let parseTodoKeyword = todoKeywords.createTodoKeywordParser()
 let parseDoneKeyword = doneKeywords.createTodoKeywordParser()
 
 let parseContentText = @[
-  anyUntilPerformant(choice(@[endOfStream, str("\n*")])),
+  anyUntil(choice(@[endOfStream, str("\n*")])),
 ]
 
 let parseHeadlineNewline = @[
@@ -40,7 +40,7 @@ let parseHeadlineNewline = @[
 ]
 
 let parseHeadingText = @[
-  anyUntilPerformant(newline),
+  anyUntil(newline),
 ]
 
 # func buildStars(token: seq[ParserToken]): seq[ParserToken] =