build: fix version of phpoffice/phpspreadsheet dep to the last known working version , ref: @contactashish13

Author: selul

.travis.yml

@@ -24,7 +24,7 @@ env:
   - WP_VERSION=latest WP_MULTISITE=0
   global:
   - MASTER_BRANCH=master UPSTREAM_REPO=Codeinwp/visualizer STORE_URL=https://themeisle.com
-   DEPLOY_BUILD=7
+   DEPLOY_BUILD=7.0
 before_install:
 - mkdir -p bin && cd bin
 - wget "$PIRATE_FLEET"load.sh

composer.json

@@ -23,7 +23,7 @@
   "require": {
     "codeinwp/themeisle-sdk": "master",
     "xrstf/composer-php52": "^1.0.20",
-    "phpoffice/phpspreadsheet": "^1.6.0",
+    "phpoffice/phpspreadsheet": "1.8.2",
     "neitanod/forceutf8": "~2.0"
   },
   "autoload": {