Update gcmt_request.py
Update gcmt_request.py

some tweaks to dynamically redefine years in initial_full_search_request
rafiqsaleh/VERCE,KNMI/VERCE,rafiqsaleh/VERCE,KNMI/VERCE,rafiqsaleh/VERCE,KNMI/VERCE,rafiqsaleh/VERCE,KNMI/VERCE,rafiqsaleh/VERCE,KNMI/VERCE