[README] Add "Optimization" section as a suggestion

pH-7 · Apr 9, 2019 · 4e4ece8 · 4e4ece8
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diff --git a/README.md b/README.md
@@ -70,6 +70,11 @@ if ($oVatValidator->check()) {
 ```
 
 
+## Optimization (Suggestion)
+
+Depending of the use of this library, it could be handy to cache the result specifically for a specified VAT number.
+
+
 ## Requirements
 
 * PHP 7.0 or higher