CREATE TABLE table_60138 ("Club" TEXT, "Nickname" TEXT, "Location" TEXT, "GFL Premierships" TEXT, "Years in GFL" TEXT)

What is the nickname of the team who was in the GFL from 1986-1988?
SELECT "Nickname" FROM table_60138 WHERE "Years in GFL" = '1986-1988'
SELECT "Nickname" FROM "table_60138" WHERE "Years in GFL" = '1986-1988'