Fix Specification-Version release date in manifest

Author: emlun

NEWS

@@ -4,6 +4,7 @@ Packaging fixes:
 
 * Fixed dependency declarations so API dependencies are correctly propagated as
   compile-time dependencies of dependent projects.
+* Fixed Specification-Version release date in webauthn-server-core jar manifest.
 
 
 == Version 1.4.0 ==

webauthn-server-core/build.gradle

@@ -41,7 +41,7 @@ jar {
   manifest {
     attributes([
       'Specification-Title': 'Web Authentication: An API for accessing Public Key Credentials',
-      'Specification-Version': 'Level 1 Proposed Recommendation 2019-01-17',
+      'Specification-Version': 'Level 1 Recommendation 2019-03-04',
       'Specification-Vendor': 'World Wide Web Consortium',
       'Implementation-Id': 'java-webauthn-server',
       'Implementation-Title': 'Yubico Web Authentication server library',