Add $insertions_count and $deletions_count.

[0b10011]

Add counter to keep track of the number of insertions and deletions. Replacements are considered 1 insertion and 1 deletion.

Example

<?php
$old = 'abc def';
$new = 'hbc ef g';
$diff = new FineDiff($old, $new);
echo $diff->insertions_count; // 2
echo $diff->deletions_count; // 2

[jgutix]

Useful. +1