RFC 1857 is Stabilize drop order

Author: aturon

text/0000-stabilize-drop-order.md renamed to text/1857-stabilize-drop-order.md

@@ -1,7 +1,7 @@
 - Feature Name: stable_drop_order
 - Start Date: 2017-01-19
-- RFC PR: (leave this empty)
-- Rust Issue: (leave this empty)
+- RFC PR: https://github.com/rust-lang/rfcs/pull/1857
+- Rust Issue: https://github.com/rust-lang/rust/issues/43034
 
 # Summary
 [summary]: #summary