upgraded dependencies

vendor/guzzlehttp/guzzle/UPGRADING.md

@@ -1,10 +1,60 @@
 Guzzle Upgrade Guide
 ====================
 
+6.0 to 7.0
+----------
+
+In order to take advantage of the new features of PHP, Guzzle dropped the support
+of PHP 5. The minimum supported PHP version is now PHP 7.2. Type hints and return
+types for functions and methods have been added wherever possible. 
+
+Please make sure:
+- You are calling a function or a method with the correct type.
+- If you extend a class of Guzzle; update all signatures on methods you override.
+
+#### Other backwards compatibility breaking changes
+
+- Class `GuzzleHttp\UriTemplate` is removed.
+- Class `GuzzleHttp\Exception\SeekException` is removed.
+- Classes `GuzzleHttp\Exception\BadResponseException`, `GuzzleHttp\Exception\ClientException`, 
+  `GuzzleHttp\Exception\ServerException` can no longer be initialized with an empty
+  Response as argument.
+- Class `GuzzleHttp\Exception\ConnectException` now extends `GuzzleHttp\Exception\TransferException`
+  instead of `GuzzleHttp\Exception\RequestException`.
+- Function `GuzzleHttp\Exception\ConnectException::getResponse()` is removed.
+- Function `GuzzleHttp\Exception\ConnectException::hasResponse()` is removed.
+- Constant `GuzzleHttp\ClientInterface::VERSION` is removed. Added `GuzzleHttp\ClientInterface::MAJOR_VERSION` instead.
+- Function `GuzzleHttp\Exception\RequestException::getResponseBodySummary` is removed.
+  Use `\GuzzleHttp\Psr7\get_message_body_summary` as an alternative.
+- Function `GuzzleHttp\Cookie\CookieJar::getCookieValue` is removed.
+- Request option `exception` is removed. Please use `http_errors`.
+- Request option `save_to` is removed. Please use `sink`.
+- Pool option `pool_size` is removed. Please use `concurrency`.
+- We now look for environment variables in the `$_SERVER` super global, due to thread safety issues with `getenv`. We continue to fallback to `getenv` in CLI environments, for maximum compatibility.
+- The `get`, `head`, `put`, `post`, `patch`, `delete`, `getAsync`, `headAsync`, `putAsync`, `postAsync`, `patchAsync`, and `deleteAsync` methods are now implemented as genuine methods on `GuzzleHttp\Client`, with strong typing. The original `__call` implementation remains unchanged for now, for maximum backwards compatibility, but won't be invoked under normal operation.
+- The `log` middleware will log the errors with level `error` instead of `notice` 
+- Support for international domain names (IDN) is now disabled by default, and enabling it requires installing ext-intl, linked against a modern version of the C library (ICU 4.6 or higher).
+
+#### Native functions calls
+
+All internal native functions calls of Guzzle are now prefixed with a slash. This
+change makes it impossible for method overloading by other libraries or applications.
+Example:
+
+```php
+// Before:
+curl_version();
+
+// After:
+\curl_version();
+```
+
+For the full diff you can check [here](https://github.com/guzzle/guzzle/compare/6.5.4..master).
+
 5.0 to 6.0
 ----------
 
-Guzzle now uses [PSR-7](http://www.php-fig.org/psr/psr-7/) for HTTP messages.
+Guzzle now uses [PSR-7](https://www.php-fig.org/psr/psr-7/) for HTTP messages.
 Due to the fact that these messages are immutable, this prompted a refactoring
 of Guzzle to use a middleware based system rather than an event system. Any
 HTTP message interaction (e.g., `GuzzleHttp\Message\Request`) need to be
@@ -167,7 +217,7 @@ passing a `GuzzleHttp\Adapter\AdapterInterface`, you must now pass a PHP
 
 ## Removed Fluent Interfaces
 
-[Fluent interfaces were removed](http://ocramius.github.io/blog/fluent-interfaces-are-evil)
+[Fluent interfaces were removed](https://ocramius.github.io/blog/fluent-interfaces-are-evil/)
 from the following classes:
 
 - `GuzzleHttp\Collection`
@@ -820,7 +870,7 @@ HeaderInterface (e.g. toArray(), getAll(), etc.).
 3.3 to 3.4
 ----------
 
-Base URLs of a client now follow the rules of http://tools.ietf.org/html/rfc3986#section-5.2.2 when merging URLs.
+Base URLs of a client now follow the rules of https://tools.ietf.org/html/rfc3986#section-5.2.2 when merging URLs.
 
 3.2 to 3.3
 ----------