docs(readme.md): fix index links

README.md

@@ -395,28 +395,28 @@ if ($myCustomValidationFail) {
 ## Available Rules
 
 1. [alpha](#alpha)
-1. [alpha_numeric](#alphanumeric)
+1. [alpha_numeric](#alpha_numeric)
 1. [between](#between)
-1. [between_length](#betweenlength)
-1. [boolean_value](#booleanvalue)
+1. [between_length](#between_length)
+1. [boolean_value](#boolean_value)
 1. [contains](#contains)
 1. [date](#date)
 1. [email](#email)
 1. [equals](#equals)
-1. [file_max_size](#filemaxsize)
-1. [file_mime_type](#filemimetype)
-1. [float_number](#floatnumber)
-1. [image_max_height](#imagemaxheight)
-1. [image_max_width](#imagemaxwidth)
-1. [image_min_height](#imageminheight)
-1. [image_min_width](#imageminwidth)
+1. [file_max_size](#file_max_size)
+1. [file_mime_type](#file_mime_type)
+1. [float_number](#float_number)
+1. [image_max_height](#image_max_height)
+1. [image_max_width](#image_max_width)
+1. [image_min_height](#image_min_height)
+1. [image_min_width](#image_min_width)
 1. [ip](#ip)
 1. [ipv4](#ipv4)
 1. [ipv6](#ipv6)
 1. [max](#max)
-1. [max_length](#maxlength)
+1. [max_length](#max_length)
 1. [min](#min)
-1. [min_length](#minlength)
+1. [min_length](#min_length)
 1. [numeric](#numeric)
 1. [regex](#regex)
 1. [required](#required)