Avoid retaining pendingRequest after succeeds.
Avoid retaining pendingRequest after succeeds.

afnan-ahmad/Swift-Google-Maps-API,honghaoz/Swift-Google-Maps-API,honghaoz/Swift-Google-Maps-API,afnan-ahmad/Swift-Google-Maps-API,afnan-ahmad/Swift-Google-Maps-API,afnan-ahmad/Swift-Google-Maps-API