BRIEF-Antero Midstream Partners files for resale of 8 mln common units by selling unitholder

* Files to say selling unitholder, antero resources corp is selling 8 million of co's common units - sec filing Source text: 1.usa.gov/1pz9F1j Further company coverage: (Bengaluru Newsroom +91 80 6749-1130; within U.S. +1 646 223 8780)