[#2002] changelog update for 4.0.0
[#2002] changelog update for 4.0.0

PaulVanSchayck/irods,janiheikkinen/irods,leesab/irods,leesab/irods,janiheikkinen/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,leesab/irods,PaulVanSchayck/irods,leesab/irods,janiheikkinen/irods,PaulVanSchayck/irods,leesab/irods,leesab/irods,PaulVanSchayck/irods,PaulVanSchayck/irods,janiheikkinen/irods,janiheikkinen/irods,leesab/irods,PaulVanSchayck/irods,janiheikkinen/irods,PaulVanSchayck/irods,janiheikkinen/irods,janiheikkinen/irods,janiheikkinen/irods