add cargo-update (#320)

- add cargo-update to build system list (subcommand for checking and applying updates to installed executables)
- move cargo-benchcmp to the top of the list (see CONTRIBUTING.md "please pay attention to the alphabetical ordering")
- add build passing/failing badges for cargo-{benchcmp, do, release, script}

README.md

@@ -172,9 +172,10 @@ See also [Friends of Rust](https://www.rust-lang.org/friends.html) (organization
 ### Build system
 
 * [Cargo](https://crates.io/) — the Rust package manager
+  * [BurntSushi/cargo-benchcmp](https://github.com/BurntSushi/cargo-benchcmp) [[cargo-benchcmp](https://crates.io/crates/cargo-benchcmp)] — utility to compare Rust micro-benchmarks [<img src="https://api.travis-ci.org/BurntSushi/cargo-benchcmp.svg?branch=master">](https://travis-ci.org/BurntSushi/cargo-benchcmp)
   * [rsolomo/cargo-check](https://github.com/rsolomo/cargo-check) [[cargo-check](https://crates.io/crates/cargo-check)] — a wrapper around `cargo rustc -- -Zno-trans` which can be helpful for running a faster compile if you only need correctness checks [<img src="https://api.travis-ci.org/rsolomo/cargo-check.svg?branch=master">](https://travis-ci.org/rsolomo/cargo-check)
   * [kbknapp/cargo-count](https://github.com/kbknapp/cargo-count) [[cargo-count](https://crates.io/crates/cargo-count)] — lists source code counts and details about cargo projects, including unsafe statistics [<img src="https://api.travis-ci.org/kbknapp/cargo-count.svg?branch=master">](https://travis-ci.org/kbknapp/cargo-count)
-  * [pwoolcoc/cargo-do](https://github.com/pwoolcoc/cargo-do) [[cargo-do](https://crates.io/crates/cargo-do)] — run multiple cargo commands in a row
+  * [pwoolcoc/cargo-do](https://github.com/pwoolcoc/cargo-do) [[cargo-do](https://crates.io/crates/cargo-do)] — run multiple cargo commands in a row [<img src="https://api.travis-ci.org/pwoolcoc/cargo-do.svg?branch=master">](https://travis-ci.org/pwoolcoc/cargo-do)
   * [maxsnew/cargo-dot](https://github.com/maxsnew/cargo-dot) — generate graphs of a Cargo project's dependencies [<img src="https://api.travis-ci.org/maxsnew/cargo-dot.svg?branch=master">](https://travis-ci.org/maxsnew/cargo-dot)
   * [killercup/cargo-edit](https://github.com/killercup/cargo-edit) [[cargo-edit](https://crates.io/crates/cargo-edit)] — allows you to add and list dependencies by reading/writing to your Cargo.toml file from the command line [<img src="https://api.travis-ci.org/killercup/cargo-edit.svg?branch=master">](https://travis-ci.org/killercup/cargo-edit)
   * [Ralvke/cargo-find](https://github.com/Ralvke/cargo-find) [[cargo-find](https://crates.io/crates/cargo-find)] — Find crates from command line [<img src="https://api.travis-ci.org/Ralvke/cargo-find.svg?branch=master">](https://travis-ci.org/Ralvke/cargo-find)
@@ -184,10 +185,10 @@ See also [Friends of Rust](https://www.rust-lang.org/friends.html) (organization
   * [regexident/cargo-modules](https://github.com/regexident/cargo-modules) [[cargo-modules](https://crates.io/crates/cargo-modules)] — A cargo plugin for showing a tree-like overview of a crate's modules. [<img src="https://api.travis-ci.org/regexident/cargo-modules.svg?branch=master">](https://travis-ci.org/regexident/cargo-modules)
   * [imp/cargo-multi](https://github.com/imp/cargo-multi) [[cargo-multi](https://crates.io/crates/cargo-multi)] — runs specified cargo command on multiple crates [<img src="https://api.travis-ci.org/imp/cargo-multi.svg?branch=master">](https://travis-ci.org/imp/cargo-multi)
   * [kbknapp/cargo-outdated](https://github.com/kbknapp/cargo-outdated) [[cargo-outdated](https://crates.io/crates/cargo-outdated)] — displays when newer versions of Rust dependencies are available, or out of date [<img src="https://api.travis-ci.org/kbknapp/cargo-outdated.svg?branch=master">](https://travis-ci.org/kbknapp/cargo-outdated)
-  * [sunng87/cargo-release](https://github.com/sunng87/cargo-release) [[cargo-release](https://crates.io/crates/cargo-release)] — tool for releasing git-managed cargo project, build, tag, publish, doc and push
-  * [DanielKeep/cargo-script](https://github.com/DanielKeep/cargo-script) [[cargo-script](https://crates.io/crates/cargo-script)] — lets people quickly and easily run Rust "scripts" which can make use of Cargo's package ecosystem
+  * [sunng87/cargo-release](https://github.com/sunng87/cargo-release) [[cargo-release](https://crates.io/crates/cargo-release)] — tool for releasing git-managed cargo project, build, tag, publish, doc and push [<img src="https://api.travis-ci.org/sunng87/cargo-release.svg?branch=master">](https://travis-ci.org/sunng87/cargo-release)
+  * [DanielKeep/cargo-script](https://github.com/DanielKeep/cargo-script) [[cargo-script](https://crates.io/crates/cargo-script)] — lets people quickly and easily run Rust "scripts" which can make use of Cargo's package ecosystem [<img src="https://api.travis-ci.org/DanielKeep/cargo-script.svg?branch=master">](https://travis-ci.org/DanielKeep/cargo-script)
+  * [nabijaczleweli/cargo-update](https://github.com/nabijaczleweli/cargo-update) [[cargo-update](https://crates.io/crates/cargo-update)] - cargo subcommand for checking and applying updates to installed executables [<img src="https://api.travis-ci.org/nabijaczleweli/cargo-update.svg?branch=master">](https://travis-ci.org/nabijaczleweli/cargo-update)
   * [passcod/cargo-watch](https://github.com/passcod/cargo-watch) [[cargo-watch](https://crates.io/crates/cargo-watch)] — utility for cargo to compile projects when sources change [<img src="https://api.travis-ci.org/passcod/cargo-watch.svg?branch=master">](https://travis-ci.org/passcod/cargo-watch)
-  * [BurntSushi/cargo-benchcmp](https://github.com/BurntSushi/cargo-benchcmp) [[cargo-benchcmp](https://crates.io/crates/cargo-benchcmp)] — utility to compare Rust micro-benchmarks
 * CMake
   * [SiegeLord/RustCMake](https://github.com/SiegeLord/RustCMake) — an example project showing usage of CMake with Rust [<img src="https://api.travis-ci.org/SiegeLord/RustCMake.svg?branch=master">](https://travis-ci.org/SiegeLord/RustCMake)