By Alek Arend The Buffalo Bills are keeping their defensive anchor, Ed Oliver, for at least the next two years. On Tuesday, the Bills picked up Oliver’s fifth-year option. That ensures he’ll remain in Buffalo through the 2023 season. The organization had until May 2 to make such a decision, but clearly didn’t need more time to decide. Oliver has played the first three years of his NFL career with the Bills. He’s totaled 117 tackles and 12 sacks during that span. The former Houston star is the fourth 2019 draftee to have his fifth-year option picked up. “The #Bills exercised the fifth-year opti…