title: phpspreadsheet composer not installing
body: <p>I am running composer locally to generate the necessary files that I will then deploy separately to server.  Therefore I am running:</p>
  
  <pre><code>composer require phpoffice/phpspreadsheet --ignore-platform-reqs
  </code></pre>
  
  <p>However, it is failing:</p>
  
  <pre><code>Problem 1
      - The requested package phpoffice/phpspreadsheet No version set (parsed as 1.0.0) is satisfiable by phpoffice/phpspreadsheet[No version set (parsed as 1.0.0)] but these conflict with your requirements or minimum-stability.
  </code></pre>
  
  <p>I am not familiar with composer.  I have tried the solution suggested here <a href="https://github.com/google/google-api-php-client/issues/971" rel="nofollow noreferrer">https://github.com/google/google-api-php-client/issues/971</a> by adding <code>"phpoffice/phpspreadsheet":"^1.0"</code> to the composer.json, but that didn't work.  I have also tried setting the minimum stability to <code>dev</code> with no luck.</p>
  
  <p>Can someone help?</p>
  
  <p>Edit with more info***</p>
  
  <p>I have PHP 7.2 installed, full .json is the same as available from <a href="https://github.com/PHPOffice/PhpSpreadsheet" rel="nofollow noreferrer">https://github.com/PHPOffice/PhpSpreadsheet</a></p>
  
  <p>Here:</p>
  
  <pre><code>{
      "name": "phpoffice/phpspreadsheet",
      "description": "PHPSpreadsheet - Read, Create and Write Spreadsheet documents in PHP - Spreadsheet engine",
      "keywords": ["PHP", "OpenXML", "Excel", "xlsx", "xls", "ods", "gnumeric", "spreadsheet"],
      "homepage": "https://github.com/PHPOffice/PhpSpreadsheet",
      "type": "library",
      "license": "LGPL-2.1-or-later",
      "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"
          }
      ],
      "scripts": {
          "check": [
              "php-cs-fixer fix --ansi --dry-run --diff",
              "phpcs --report-width=200 --report-summary  --report-full samples/ src/ tests/ --ignore=samples/Header.php --standard=PSR2 -n",
              "phpunit --color=always"
          ],
          "fix": [
              "php-cs-fixer fix --ansi"
          ]
      },
        "require": {
          "php": "^5.6|^7.0",
          "ext-ctype": "*",
          "ext-dom": "*",
          "ext-gd": "*",
          "ext-iconv": "*",
          "ext-libxml": "*",
          "ext-mbstring": "*",
          "ext-SimpleXML": "*",
          "ext-xml": "*",
          "ext-xmlreader": "*",
          "ext-xmlwriter": "*",
          "ext-zip": "*",
          "ext-zlib": "*",
          "psr/simple-cache": "^1.0"
      },
      "require-dev": {
          "tecnickcom/tcpdf": "^6.2",
          "squizlabs/php_codesniffer": "^2.7",
          "phpunit/phpunit": "^5.7",
          "dompdf/dompdf": "^0.8.0",
          "mpdf/mpdf": "^7.0.0",
          "jpgraph/jpgraph": "^4.0",
          "friendsofphp/php-cs-fixer": "@stable"
      },
      "suggest": {
          "mpdf/mpdf": "Option for rendering PDF with PDF Writer",
          "dompdf/dompdf": "Option for rendering PDF with PDF Writer",
          "tecnick.com/tcpdf": "Option for rendering PDF with PDF Writer",
          "jpgraph/jpgraph": "Option for rendering charts, or including charts with PDF or HTML Writers"
      },
      "autoload": {
          "psr-4": {
              "PhpOffice\\PhpSpreadsheet\\": "src/PhpSpreadsheet"
          }
      },
      "autoload-dev": {
          "psr-4": {
              "PhpOffice\\PhpSpreadsheetTests\\": "tests/PhpSpreadsheetTests"
          }
      }
  }
  </code></pre>