Merge branch 'master' of github.com:box/spout into add-phpstan

 Conflicts:

	.travis.yml

	CONTRIBUTING.md

	composer.json

	src/Spout/Common/Entity/Cell.php

	tests/Spout/Writer/ODS/WriterTest.php

tests/Spout/Reader/XLSX/Helper/CellValueFormatterTest.php

@@ -197,18 +197,22 @@ class CellValueFormatterTest extends TestCase
     public function testFormatInlineStringCellValue($value, $expectedFormattedValue)
     {
         $nodeListMock = $this->createMock(\DOMNodeList::class);
+        $nodeListMock
+            ->expects($this->atLeastOnce())
+            ->method('count')
+            ->willReturn(1);
         $nodeListMock
             ->expects($this->atLeastOnce())
             ->method('item')
             ->with(0)
-            ->will($this->returnValue((object) ['nodeValue' => $value]));
+            ->willReturn((object) ['nodeValue' => $value]);
 
         $nodeMock = $this->createMock(\DOMElement::class);
         $nodeMock
             ->expects($this->atLeastOnce())
             ->method('getElementsByTagName')
             ->with(CellValueFormatter::XML_NODE_INLINE_STRING_VALUE)
-            ->will($this->returnValue($nodeListMock));
+            ->willReturn($nodeListMock);
 
         /** @var SharedStringsManager $sharedStringManager */
         $sharedStringManager = $this->createMock(SharedStringsManager::class);