Revert "composer package update"

This reverts commit e979959219.

vendor/guzzlehttp/psr7/src/Request.php

@@ -36,7 +36,6 @@ class Request implements RequestInterface
         $body = null,
         $version = '1.1'
     ) {
-        $this->assertMethod($method);
         if (!($uri instanceof UriInterface)) {
             $uri = new Uri($uri);
         }
@@ -46,7 +45,7 @@ class Request implements RequestInterface
         $this->setHeaders($headers);
         $this->protocol = $version;
 
-        if (!isset($this->headerNames['host'])) {
+        if (!$this->hasHeader('Host')) {
             $this->updateHostFromUri();
         }
 
@@ -92,7 +91,6 @@ class Request implements RequestInterface
 
     public function withMethod($method)
     {
-        $this->assertMethod($method);
         $new = clone $this;
         $new->method = strtoupper($method);
         return $new;
@@ -112,7 +110,7 @@ class Request implements RequestInterface
         $new = clone $this;
         $new->uri = $uri;
 
-        if (!$preserveHost || !isset($this->headerNames['host'])) {
+        if (!$preserveHost) {
             $new->updateHostFromUri();
         }
 
@@ -141,11 +139,4 @@ class Request implements RequestInterface
         // See: http://tools.ietf.org/html/rfc7230#section-5.4
         $this->headers = [$header => [$host]] + $this->headers;
     }
-
-    private function assertMethod($method)
-    {
-        if (!is_string($method) || $method === '') {
-            throw new \InvalidArgumentException('Method must be a non-empty string.');
-        }
-    }
 }