Add suggestion output style

src-tests/Console/Style/Fixtures/suggestion.txt

@@ -0,0 +1,3 @@
+
+ [💡] Suggestion message                                                                                                 
+

src-tests/Console/Style/StewardStyleTest.php

@@ -186,6 +186,16 @@ public function testShouldFormatNote(): void
         );
     }
 
+    public function testShouldFormatSuggestion(): void
+    {
+        $this->style->suggestion('Suggestion message');
+
+        $this->assertStringEqualsFile(
+            __DIR__ . '/Fixtures/suggestion.txt',
+            $this->normalizeLineEndings($this->outputBuffer->fetch())
+        );
+    }
+
     public function testShouldFormatQuestion(): void
     {
         $inputMock = $this->getMockBuilder(StreamableInputInterface::class)->getMock();

src/Console/Command/InstallCommand.php

@@ -110,7 +110,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
                 )
             );
 
-            $this->io->note('Downloading may take a while... (File size over 20 MB.)');
+            $this->io->note('Downloading may take a while... (File size is over 20 MB.)');
         }
 
         $downloadedSize = $downloader->download();
@@ -179,7 +179,7 @@ private function askForVersion(bool $isInteractiveInput): string
 
     private function printLinkToWiki(): void
     {
-        $this->io->note(
+        $this->io->suggestion(
             'What now? Learn how to start the Selenium server: '
             . 'https://github.com/lmc-eu/steward/wiki/Selenium-server-&-browser-drivers'
         );

src/Console/Style/StewardStyle.php

@@ -139,6 +139,11 @@ public function note($message): void
         $this->symfonyStyle->block($message, 'NOTE', 'fg=yellow', ' ');
     }
 
+    public function suggestion($message): void
+    {
+        $this->symfonyStyle->block($message, '💡', 'fg=yellow', ' ');
+    }
+
     public function caution($message): void
     {
         throw new \BadMethodCallException('Method not implemented');