Improve documentation.

Author: chinthakagodawita

README.md

@@ -35,10 +35,9 @@ class RoboFile extends \Robo\Tasks {
 
     public function taskSplitTests(): \Robo\Result
     {
-        return $this->taskSplitTestsByTime(
-          3,
-          '_data/time_report.json'
-        )
+        $groups = 3;
+        $timeReportLocation = '_data/time_report.json';
+        return $this->taskSplitTestsByTime($groups, $timeReportLocation)
           ->projectRoot('.')
           ->testsFrom('tests')
           ->groupsTo('tests/_data/timekeeper/group_')

src/TimeSplitterTask.php

@@ -30,7 +30,7 @@ class TimeSplitterTask extends BaseTask
     /**
      * @var string The filename pattern under which groups will be saved.
      */
-    private $groupOutputLoc = '_data/timekeeper/group_';
+    private $groupOutputLoc = 'tests/_data/timekeeper/group_';
 
     /**
      * @var string The directory that holds test files.