Fixed annotation for Chrome.createProcess $cmdLine type. Updated test to pass correct type.

Author: CraicOverflow89

src/Chrome.php

@@ -43,7 +43,7 @@ public function __construct($binary = 'chrome-pdf', $processClass = null)
     /**
      * A factory for creating process classes, to execute the binary
      *
-     * @param  string $cmdline The command to run
+     * @param  array $cmdline The command to run
      * @return object
      */
     public function createProcess($cmdline)

test/ChromeTest.php

@@ -54,10 +54,10 @@ public function test_callsSpecifiedBinary()
     public function test_createProcessFactory()
     {
         $pdf = new Chrome();
-        $this->assertInstanceOf(Process::class, $pdf->createProcess(''));
+        $this->assertInstanceOf(Process::class, $pdf->createProcess([]));
 
         $pdf = new Chrome('', TestProcessRunner::class);
-        $this->assertInstanceOf(TestProcessRunner::class, $pdf->createProcess(''));
+        $this->assertInstanceOf(TestProcessRunner::class, $pdf->createProcess([]));
     }
 
     public function test_sandboxOption()