Add seanmonstar/pretty-env-logger to Logging

https://github.com/seanmonstar/pretty-env-logger

README.md

@@ -1119,6 +1119,7 @@ See also [Are we game yet?](http://arewegameyet.com)
 
 [[log](https://crates.io/keywords/log)]
 
+* [seanmonstar/pretty-env-logger](https://github.com/seanmonstar/pretty-env-logger) — A pretty, easy-to-use logger for Rust. [![Build Status](https://api.travis-ci.com/seanmonstar/pretty-env-logger.svg?branch=master)](https://travis-ci.org/seanmonstar/pretty-env-logger)
 * [rust-lang-nursery/log](https://github.com/rust-lang-nursery/log) — Logging implementation for Rust [![Build Status](https://api.travis-ci.com/rust-lang-nursery/log.svg?branch=master)](https://travis-ci.org/rust-lang-nursery/log)
 * [slog-rs/slog](https://github.com/slog-rs/slog) — Structured, composable logging for Rust [![Build Status](https://api.travis-ci.org/slog-rs/slog.svg?branch=master)](https://travis-ci.org/slog-rs/slog)
 * [sfackler/log4rs](https://github.com/sfackler/log4rs) — highly configurable logging framework modeled after Java's Logback and log4j libraries [![Build Status](https://api.travis-ci.org/sfackler/log4rs.svg?branch=master)](https://travis-ci.org/sfackler/log4rs)