updated the README.md file to reflect the new API in "master" branch.
updated the README.md file to reflect the new API in "master" branch.

redminenb/redmine-java-api,taskadapter/redmine-java-api,sleroy/redmine-java-api,sleroy/redmine-java-api,redminenb/redmine-java-api,taskadapter/redmine-java-api