METALS-London copper heads for biggest weekly drop since early May

(Updates prices) MELBOURNE, June 16 (Reuters) - London copper edged up on Friday but was still eyeing its biggest weekly drop since early May as markets priced in a higher U.S. interest rate environment that would support the dollar. * LME COPPER: London Metal Exchange copper rose by half a percent to $5,668 a tonne, by 0700 GMT, shedding losses from the previous session. Copper is still down around 2 percent for the week. * ShFE COPPER: Shanghai Futures Exchange copper closed slig