reduce duplicate links

README.md

@@ -364,6 +364,7 @@ See also [https://areweideyet.com/](https://areweideyet.com/) and [Rust and IDEs
 * [jaysonsantos/bmemcached-rs](https://github.com/jaysonsantos/bmemcached-rs) — Memcached library written in pure rust [<img src="https://api.travis-ci.org/jaysonsantos/bmemcached-rs.svg?branch=master">](https://travis-ci.org/jaysonsantos/bmemcached-rs)
 * [jaemk/cached](https://github.com/jaemk/cached) — Simple function caching/memoization
 
+
 ### Concurrency
 
 * [crossbeam-rs/crossbeam](https://github.com/crossbeam-rs/crossbeam) – Support for parallelism and low-level concurrency in Rust [<img src="https://api.travis-ci.org/crossbeam-rs/crossbeam.svg?branch=master">](https://travis-ci.org/crossbeam-rs/crossbeam)
@@ -632,9 +633,9 @@ See also [https://areweideyet.com/](https://areweideyet.com/) and [Rust and IDEs
 * Game Engines
   * [Amethyst](https://www.amethyst.rs) — Data-oriented game engine [<img src="https://api.travis-ci.org/amethyst/amethyst.svg?branch=master">](https://travis-ci.org/amethyst/amethyst)
   * [Piston](http://www.piston.rs) — [<img src="https://api.travis-ci.org/PistonDevelopers/piston.svg?branch=master">](https://travis-ci.org/PistonDevelopers/piston)
-* SDL [[sdl](https://crates.io/keywords/sdl)]
-  * [brson/rust-sdl](https://github.com/brson/rust-sdl) — [SDL1](http://www.libsdl.org/) bindings [<img src="https://api.travis-ci.org/brson/rust-sdl.svg?branch=master">](https://travis-ci.org/brson/rust-sdl)
-  * [AngryLawyer/rust-sdl2](https://github.com/AngryLawyer/rust-sdl2) — [SDL2](http://www.libsdl.org/) bindings [<img src="https://api.travis-ci.org/AngryLawyer/rust-sdl2.svg?branch=master">](https://travis-ci.org/AngryLawyer/rust-sdl2)
+* [SDL](http://www.libsdl.org/) [[sdl](https://crates.io/keywords/sdl)]
+  * [brson/rust-sdl](https://github.com/brson/rust-sdl) — SDL1 bindings [<img src="https://api.travis-ci.org/brson/rust-sdl.svg?branch=master">](https://travis-ci.org/brson/rust-sdl)
+  * [AngryLawyer/rust-sdl2](https://github.com/AngryLawyer/rust-sdl2) — SDL2 bindings [<img src="https://api.travis-ci.org/AngryLawyer/rust-sdl2.svg?branch=master">](https://travis-ci.org/AngryLawyer/rust-sdl2)
 * SFML
   * [jeremyletang/rust-sfml](https://github.com/jeremyletang/rust-sfml) — [SFML](https://www.sfml-dev.org/) bindings [<img src="https://api.travis-ci.org/jeremyletang/rust-sfml.svg?branch=master">](https://travis-ci.org/jeremyletang/rust-sfml)
 * Voxlap
@@ -868,7 +869,7 @@ See also [Rust web framework comparison](https://github.com/flosse/rust-web-fram
   * [Ogeon/rustful](https://github.com/Ogeon/rustful) — a RESTful web framework for Rust  [<img src="https://api.travis-ci.org/Ogeon/rustful.svg?branch=master">](https://travis-ci.org/Ogeon/rustful)
   * [Rocket](https://github.com/SergioBenitez/Rocket) — Rocket is web framework for Rust (nightly) with a focus on ease-of-use, expressability, and speed [<img src="https://api.travis-ci.org/SergioBenitez/Rocket.svg?branch=master">](https://travis-ci.org/SergioBenitez/Rocket)
   * [Rustless](https://github.com/rustless/rustless) — a REST-like API micro-framework inspired by [Grape](https://github.com/ruby-grape/grape) and [Hyper](https://github.com/hyperium/hyper) [<img src="https://api.travis-ci.org/rustless/rustless.svg?branch=master">](https://travis-ci.org/rustless/rustless)
-  * [sappworks/sapper](https://github.com/sappworks/sapper) — A lightweight web framework built on async hyper, implemented in Rust language. [<img src="https://api.travis-ci.org/sappworks/sapper.svg?branch=master">](https://travis-ci.org/tomaka/rouille)
+  * [sappworks/sapper](https://github.com/sappworks/sapper) — A lightweight web framework built on async hyper, implemented in Rust language. [<img src="https://api.travis-ci.org/sappworks/sapper.svg?branch=master">](https://travis-ci.org/sappworks/sapper)
   * [tiny-http](https://github.com/tiny-http/tiny-http) — Low level HTTP server library [<img src="https://api.travis-ci.org/frewsxcv/tiny-http.svg?branch=master">](https://travis-ci.org/frewsxcv/tiny-http)
   * [tomaka/rouille](https://github.com/tomaka/rouille) — Web framework in Rust[<img src="https://api.travis-ci.org/tomaka/rouille.svg?branch=master">](https://travis-ci.org/tomaka/rouille)
 * [WebSocket](https://datatracker.ietf.org/doc/rfc6455/)