Add noteworthy changes for 1.7.0 to README
Add noteworthy changes for 1.7.0 to README

See issue OPENNLP-889

ragerri/opennlp,jzonthemtn/opennlp,ragerri/opennlp,apache/opennlp,apache/opennlp,ragerri/opennlp,jzonthemtn/opennlp,apache/opennlp,jzonthemtn/opennlp