Update php-matrix-sdk to guzzle 7 version

composer.json

@@ -8,8 +8,14 @@
             "name": "UPschooling"
         }
     ],
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://github.com/bziemons/matrix-php-sdk.git"
+        }
+    ],
     "require": {
-        "aryess/php-matrix-sdk": "dev-master"
+        "aryess/php-matrix-sdk": "dev-feature/guzzle7-update"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5",
@@ -19,7 +25,7 @@
         "optimize-autoloader": true,
         "classmap-authoritative": true,
         "platform": {
-            "php": "7.2"
+            "php": "7.2.5"
         }
     },
     "scripts": {