Remove no longer used duplicate_associated_type_bindings lint

The duplicate_associated_type_bindings lint seems to have been removed
with the Rust 1.32 release.
This change removes the lint from the program to prevent the newly
introduced warning from being emitted.

Author: d-e-s-o

nitrocli/src/main.rs

@@ -19,7 +19,6 @@
 
 #![deny(
   dead_code,
-  duplicate_associated_type_bindings,
   illegal_floating_point_literal_pattern,
   improper_ctypes,
   intra_doc_link_resolution_failure,