message: Switch build status badge in readme to svg
  The badge looks slightly better on high resolution density displays as an SVG!
diff: @@ -3,7 +3,7 @@ A native PostgreSQL driver for Rust.
  [Documentation](https://docs.rs/postgres/0.13.4/postgres)
  -[![Build Status](https://travis-ci.org/sfackler/rust-postgres.png?branch=master)](https://travis-ci.org/sfackler/rust-postgres) [![Latest Version](https://img.shields.io/crates/v/postgres.svg)](https://crates.io/crates/postgres)
  +[![Build Status](https://travis-ci.org/sfackler/rust-postgres.svg?branch=master)](https://travis-ci.org/sfackler/rust-postgres) [![Latest Version](https://img.shields.io/crates/v/postgres.svg)](https://crates.io/crates/postgres)
  You can integrate Rust-Postgres into your project through the [releases on crates.io](https://crates.io/crates/postgres):
  ```toml
  