fix typos

Signed-off-by: Achille Roussel <achille.roussel@gmail.com>

README.md

@@ -164,7 +164,7 @@ originating rules.
 ### Protection against DNS rebinding attacks
 
 DNS rebinding attacks occur when an attacker attempts to forge the DNS responses
-recieved by an application, to route connections to addresses of their choosing.
+received by an application, to route connections to addresses of their choosing.
 For example, they could cause the DNS resolution for *example.com* to resolve to
 *127.0.0.1*, resulting in the application unknowningly connecting to localhost
 instead of a remote server.