feat: adds --version option

tests/.snapshots/success.txt

@@ -88,12 +88,12 @@
 
    WARN  Tests\Features\Skip
   ✓ it do not skips
-  s it skips with truthy
-  s it skips with truthy condition by default
-  s it skips with message → skipped because bar
-  s it skips with truthy closure condition
+  - it skips with truthy
+  - it skips with truthy condition by default
+  - it skips with message → skipped because bar
+  - it skips with truthy closure condition
   ✓ it do not skips with falsy closure condition
-  s it skips with condition and message → skipped because foo
+  - it skips with condition and message → skipped because foo
 
    PASS  Tests\Features\Test
   ✓ a test
@@ -135,6 +135,10 @@
   ✓ it throws exception when `process isolation` is true
   ✓ it do not throws exception when `process isolation` is false
 
+   PASS  Tests\Unit\Plugins\Version
+  ✓ it outputs the version when --version is used
+  ✓ it do not outputs version when --version is not used
+
    PASS  Tests\Unit\Support\Backtrace
   ✓ it gets file name from called file
 
@@ -161,7 +165,7 @@
   ✓ it disable decorating printer when colors is set to never
 
    WARN  Tests\Visual\Success
-  s visual snapshot of test suite on success
+  - visual snapshot of test suite on success
 
-  Tests:  6 skipped, 94 passed
-  Time:   3.73s
+  Tests:  6 skipped, 96 passed
+  Time:   3.56s

tests/Unit/Plugins/Version.php

@@ -0,0 +1,20 @@
+<?php
+
+use Pest\Plugins\Version;
+use Symfony\Component\Console\Output\BufferedOutput;
+
+it('outputs the version when --version is used', function () {
+    $output = new BufferedOutput();
+    $plugin = new Version($output);
+
+    $plugin->handleArguments(['foo', '--version']);
+    assertEquals("Pest    0.2.2\n", $output->fetch());
+});
+
+it('do not outputs version when --version is not used', function () {
+    $output = new BufferedOutput();
+    $plugin = new Version($output);
+
+    $plugin->handleArguments(['foo', 'bar']);
+    assertEquals('', $output->fetch());
+});