Allow guzzle 7 (#30)

* Check against guzzle 7

* Test with guzzle 7

Author: gmponos

CHANGELOG.md

@@ -17,6 +17,8 @@ HandlerInterface::log(
 )
 ```
 
+- Allow guzzle 7
+
 ## 1.1.0 - 2019-09-03
 
 ### Added

composer.json

@@ -26,9 +26,9 @@
         }
     },
     "require": {
-        "php": ">=7.2",
+        "php": "^7.2",
         "ext-json": "*",
-        "guzzlehttp/guzzle": "^6.1",
+        "guzzlehttp/guzzle": "^6.1 || ^7.0.1",
         "psr/log": "^1.1"
     },
     "require-dev": {
@@ -48,7 +48,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.0-dev"
+            "dev-master": "2.0-dev"
         }
     },
     "minimum-stability": "stable",