upgrade

vendor/phpoffice/phpexcel/composer.json

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+{
+    "name": "phpoffice/phpexcel",
+    "description": "PHPExcel - OpenXML - Read, Create and Write Spreadsheet documents in PHP - Spreadsheet engine",
+    "keywords": ["PHP","Excel","OpenXML","xlsx","xls","spreadsheet"],
+    "homepage": "https://github.com/PHPOffice/PHPExcel",
+    "type": "library",
+    "license": "LGPL-2.1",
+    "authors": [
+        {
+            "name": "Maarten Balliauw",
+            "homepage": "http://blog.maartenballiauw.be"
+        },
+        {
+            "name": "Mark Baker",
+            "homepage": "http://markbakeruk.net"
+        },
+        {
+            "name": "Franck Lefevre",
+            "homepage": "http://rootslabs.net"
+        },
+        {
+            "name": "Erik Tilt"
+        }
+    ],
+    "require": {
+        "php": "^5.2|^7.0",
+        "ext-mbstring": "*",
+        "ext-xml": "*",
+        "ext-xmlwriter": "*"
+    },
+    "require-dev": {
+        "squizlabs/php_codesniffer": "2.*"
+    },
+    "recommend": {
+        "ext-zip": "*",
+        "ext-gd": "*"
+    },
+    "autoload": {
+        "psr-0": {
+            "PHPExcel": "Classes/"
+        }
+    }
+}