Merge pull request #1318 from telefonicaid/task/deprecate-deviceregistry-memory

Add `deviceRegistry.type=memory` deprecation message

Author: fgalan

doc/deprecated.md

@@ -19,6 +19,8 @@ A list of deprecated features and the version in which they were deprecated foll
 -   Support to Node.js v10 in iotagent-node-lib 2.15.0 (finally removed in 2.16.0)
 -   Support to Node.js v12 in iotagent-node-lib 2.24.0 (finally removed in 2.25.0)
 -   Support to NGSI-LD v1.3 in iotagent-node-lib 2.25.0 (finally removed in 2.26.0)
+-   Support groups (provision) statically defined by configuration
+-   Support to in-memory registry (i.e.`deviceRegistry.type=memory`)
 
 The use of Node.js v14 is highly recommended.