fix gh table markdown

README.md

@@ -29,27 +29,17 @@ REFERENCE
 
 According to [Wikipedia](https://en.wikipedia.org/wiki/Roman_numerals), the standard form is:
 
-+---+-----------+----------+------+-------+
-|   | Thousands | Hundreds | Tens | Units |
-+---+-----------+----------+------+-------+
+| # | Thousands | Hundreds | Tens | Units |
+|---|-----------|----------|------|-------|
 | 1 | M         | C        | X    | I     |
-+---+-----------+----------+------+-------+
 | 2 | MM        | CC       | XX   | II    |
-+---+-----------+----------+------+-------+
 | 3 | MMM       | CCC      | XXX  | III   |
-+---+-----------+----------+------+-------+
 | 4 |           | CD       | XL   | IV    |
-+---+-----------+----------+------+-------+
 | 5 |           | D        | L    | V     |
-+---+-----------+----------+------+-------+
 | 6 |           | DC       | LX   | VI    |
-+---+-----------+----------+------+-------+
 | 7 |           | DCC      | LXX  | VII   |
-+---+-----------+----------+------+-------+
 | 8 |           | DCCC     | LXXX | VIII  |
-+---+-----------+----------+------+-------+
 | 9 |           | CM       | XC   | IX    |
-+---+-----------+----------+------+-------+
 
 The numerals for 4 (IV) and 9 (IX) are written using subtractive notation,where the smaller symbol (I) is subtracted from the larger one (V, or X), thus avoiding the clumsier IIII and VIIII. Subtractive notation is also used for 40 (XL), 90 (XC), 400 (CD) and 900 (CM). These are the only subtractive forms in standard use.