typo in README.md

Author: Nicolas Maloeuvre

README.md

@@ -531,7 +531,7 @@ pp(response.attributes.multi(:not_exists))
 The `saml:AuthnContextClassRef` of the AuthNRequest can be provided by `settings.authn_context`; possible values are described at [SAMLAuthnCxt]. The comparison method can be set using `settings.authn_context_comparison` parameter. Possible values include: 'exact', 'better', 'maximum' and 'minimum' (default value is 'exact').
 To add a `saml:AuthnContextDeclRef`, define `settings.authn_context_decl_ref`.
 
-In a SP-initiaited flow, the SP can indicate to the IdP the subject that should be authenticated. This is done by defining the `settings.name_identifier_value_requested` before
+In a SP-initiated flow, the SP can indicate to the IdP the subject that should be authenticated. This is done by defining the `settings.name_identifier_value_requested` before
 building the authrequest object.