Release/1.7.0 (#437)

* Update README.md

* Release ARF version 1.7.0 (#1011)

ARF 1.7.0 Includes the result in the final discussion papers on:
- Topic F - Digital Credential API (former known as browser API) 
- Topic E - Pseudonyms, including User authentication mechanism

* Fixed editorial items

* Update CHANGELOG

* update Makefile version

Author: paolo-de-rosa

Makefile

@@ -26,7 +26,7 @@ SOURCE_DOCS    := $(MAIN_DOC) $(ANNEXES_DOCS)
 # Directories and Build Information
 BUILD_DIR      := ./build
 SITE_DIR       := ./site
-VERSION        := 1.6.1
+VERSION        := 1.7.0
 BUILD          := $(shell date +%Y%m%d.%H%M%S)
 
 # Pandoc configuration