Update hip-1340.md add working group

Signed-off-by: Michael Garber <michael.garber@hashgraph.com>

Author: mgarbs

HIP/hip-1340.md

@@ -2,6 +2,7 @@
 hip: 1340
 title: EOA Code Delegation
 author: Lukasz Gasior (@lukasz.gasior), Luke Lee (@luke.lee)
+working-group: Fernando Paris(@Ferparishuertas), Luis Mastrangelo(@acuarica), Nana Essilfie-Conduah (@Nana-EC) 
 type: Standards Track
 category: Service
 needs-hiero-approval: Yes