Update wording that referred to the year 2019 as the current year (#2390)

Author: hkosova

versions/3.1.0.md

@@ -3162,7 +3162,7 @@ animals:
 Defines a security scheme that can be used by the operations.
 
 Supported schemes are HTTP authentication, an API key (either as a header, a cookie parameter or as a query parameter), mutual TLS (use of a client certificate), OAuth2's common flows (implicit, password, client credentials and authorization code) as defined in [RFC6749](https://tools.ietf.org/html/rfc6749), and [OpenID Connect Discovery](https://tools.ietf.org/html/draft-ietf-oauth-discovery-06).
- Please note that currently (2019) the implicit flow is about to be deprecated [OAuth 2.0 Security Best Current Practice](https://tools.ietf.org/id/draft-ietf-oauth-security-topics). Recommended for most use case is Authorization Code Grant flow with PKCE.
+Please note that as of 2020, the implicit flow is about to be deprecated by [OAuth 2.0 Security Best Current Practice](https://tools.ietf.org/html/draft-ietf-oauth-security-topics). Recommended for most use case is Authorization Code Grant flow with PKCE.
 
 ##### Fixed Fields
 Field Name | Type | Applies To | Description