Document randomDigitNot base formatter.

readme.md

@@ -103,6 +103,7 @@ Each of the generator properties (like `name`, `address`, and `lorem`) are calle
 ### `Faker\Provider\Base`
 
     randomDigit             // 7
+    randomDigitNot(5)       // 0, 1, 2, 3, 4, 6, 7, 8, or 9
     randomDigitNotNull      // 5
     randomNumber($nbDigits = NULL, $strict = false) // 79907610
     randomFloat($nbMaxDecimals = NULL, $min = 0, $max = NULL) // 48.8932

src/Faker/Generator.php

@@ -132,6 +132,7 @@
  * @method boolean boolean($chanceOfGettingTrue = 50)
  *
  * @property int    $randomDigit
+ * @property int    $randomDigitNot
  * @property int    $randomDigitNotNull
  * @property string $randomLetter
  * @property string $randomAscii