Bump minimum version to 1.16

Author: sfackler

.travis.yml

@@ -3,7 +3,7 @@ cache: cargo
 sudo: required
 rust:
 - nightly
-- 1.13.0
+- 1.16.0
 addons:
   postgresql: 9.4
 before_script:

README.md

@@ -50,7 +50,7 @@ fn main() {
 ```
 
 ## Requirements
-* **Rust** - Rust-Postgres is developed against the 1.10 release of Rust
+* **Rust** - Rust-Postgres is developed against the 1.16 release of Rust
     available on http://www.rust-lang.org. It should also compile against more
     recent releases.