removed invalid IOException from "throws"
removed invalid IOException from "throws"

stephenc/redmine-java-api,taskadapter/redmine-java-api,redminenb/redmine-java-api,sleroy/redmine-java-api,redminenb/redmine-java-api,sleroy/redmine-java-api,taskadapter/redmine-java-api,Wurmy/My_Redmine-Java-API_XML