Fix typo

Author: aarmam

README.md

@@ -139,7 +139,7 @@ import eu.webeid.security.validator.AuthTokenValidatorBuilder;
 Request Filters that issue challenge nonces for regular Web eID and  Web eID for Mobile authentication flows are required for authentication.
 The filters must support POST requests.
 
-The `WebEidChallengeNonceFilter` handles `/auth/challenge` requests and issues a new nonce for regualar Web eID authentication flow.
+The `WebEidChallengeNonceFilter` handles `/auth/challenge` requests and issues a new nonce for regular Web eID authentication flow.
 See the full implementation [here](example/src/main/java/eu/webeid/example/security/WebEidChallengeNonceFilter.java).
 
 ```java