Update documentation

Author: sebastianbergmann

README.md

@@ -22,25 +22,27 @@ composer require --dev phpunit/php-code-coverage
 
 ## Usage
 
+### Collecting code coverage data and generating a report
+
 ```php
 <?php declare(strict_types=1);
-use SebastianBergmann\CodeCoverage\Filter;
-use SebastianBergmann\CodeCoverage\Driver\Selector;
 use SebastianBergmann\CodeCoverage\CodeCoverage;
-use SebastianBergmann\CodeCoverage\Report\Html\Facade as HtmlReport;
+use SebastianBergmann\CodeCoverage\Driver\Selector as DriverSelector;
+use SebastianBergmann\CodeCoverage\Filter;
+use SebastianBergmann\CodeCoverage\Report\Facade as ReportFacade;
 
 $filter = new Filter;
 
 $filter->includeFiles(
     [
         '/path/to/file.php',
         '/path/to/another_file.php',
-    ]
+    ],
 );
 
 $coverage = new CodeCoverage(
-    (new Selector)->forLineCoverage($filter),
-    $filter
+    (new DriverSelector)->forLineCoverage($filter),
+    $filter,
 );
 
 $coverage->start('<name of test>');
@@ -49,6 +51,17 @@ $coverage->start('<name of test>');
 
 $coverage->stop();
 
+ReportFacade::fromObject($coverage)->renderOpenClover('/tmp/openclover.xml');
+```
+
+### Generating a report from serialized code coverage data
+
+```php
+<?php declare(strict_types=1);
+use SebastianBergmann\CodeCoverage\Report\Facade as ReportFacade;
+use SebastianBergmann\CodeCoverage\Serialization\Unserializer;
+
+$data = (new Unserializer)->unserialize('/path/to/coverage.php');
 
-(new HtmlReport)->process($coverage, '/tmp/code-coverage-report');
+ReportFacade::fromSerializedData($data)->renderOpenClover('/tmp/openclover.xml');
 ```