docs: usage fixes

Author: andrepimpao

README.md

@@ -29,7 +29,6 @@ require_once 'vendor/autoload.php';
 Simple usage looks like:
 
 ```php
-use ProgrammatorDev\Validator\Rule;
 use ProgrammatorDev\Validator\Validator;
 
 // do this:

docs/01-get-started.md

@@ -27,7 +27,6 @@ require_once 'vendor/autoload.php';
 Simple usage looks like:
 
 ```php
-use ProgrammatorDev\Validator\Rule;
 use ProgrammatorDev\Validator\Validator;
 
 // do this:

docs/02-usage.md

@@ -103,9 +103,6 @@ try {
 catch (Exception\RangeException $exception) {
     // do something when Range fails
 }
-catch (Exception\NotBlankException $exception) {
-    // do something when NotBlank fails
-}
 catch (Exception\ChoiceException $exception) {
     // do something when Choice fails
 }