README.md update

README.md

@@ -1,18 +1,19 @@
-# go-git [![GoDoc](https://godoc.org/gopkg.in/src-d/go-git.v4?status.svg)](https://godoc.org/github.com/src-d/go-git) [![Build Status](https://travis-ci.org/src-d/go-git.svg)](https://travis-ci.org/src-d/go-git) [![Build status](https://ci.appveyor.com/api/projects/status/nyidskwifo4py6ub?svg=true)](https://ci.appveyor.com/project/mcuadros/go-git) [![codecov.io](https://codecov.io/github/src-d/go-git/coverage.svg)](https://codecov.io/github/src-d/go-git) [![codebeat badge](https://codebeat.co/badges/b6cb2f73-9e54-483d-89f9-4b95a911f40c)](https://codebeat.co/projects/github-com-src-d-go-git)
+![go-git logo](https://cdn.rawgit.com/src-d/artwork/02036484/go-git/files/go-git-github-readme-header.png)
+[![GoDoc](https://godoc.org/gopkg.in/src-d/go-git.v4?status.svg)](https://godoc.org/github.com/src-d/go-git) [![Build Status](https://travis-ci.org/src-d/go-git.svg)](https://travis-ci.org/src-d/go-git) [![Build status](https://ci.appveyor.com/api/projects/status/nyidskwifo4py6ub?svg=true)](https://ci.appveyor.com/project/mcuadros/go-git) [![codecov.io](https://codecov.io/github/src-d/go-git/coverage.svg)](https://codecov.io/github/src-d/go-git) [![Go Report Card](https://goreportcard.com/badge/github.com/src-d/go-git)](https://goreportcard.com/report/github.com/src-d/go-git)
 
-A highly extensible git implementation in **pure Go**.
+*go-git* is a highly extensible git implementation library written in **pure Go**.
 
-*go-git* aims to reach the completeness of [libgit2](https://libgit2.github.com/) or [jgit](http://www.eclipse.org/jgit/), nowadays covers the **majority** of the plumbing **read operations** and **some** of the main **write operations**, but lacks the main porcelain operations such as merges.
+It can be used to manipulate git repositories at low level *(plumbing)* or high level *(porcelain)*, through an idiomatic Go API. It also supports several type of storage, such as in-memory filesystems, or custom implementations thanks to the [`Storer`](https://godoc.org/gopkg.in/src-d/go-git.v4/plumbing/storer) interface.
 
-It is **highly extensible**, we have been following the open/close principle in its design to facilitate extensions, mainly focusing the efforts on the persistence of the objects.
+It's being actively develop since 2015 and is being use extensively by [source{d}](https://sourced.tech/) and [Keybase](https://keybase.io/blog/encrypted-git-for-everyone), and by many other libraries and tools.
 
-### ... is this production ready?
+Comparison with git
+-------------------
 
-The master branch represents the `v4` of the library, it is currently under active development and is planned to be released in early 2017.
+*go-git* aims to be fully compatible with [git](https://github.com/git/git), all the *porcelain* operations are implemented to work exactly as *git* does.
 
-If you are looking for a production ready version, please take a look to the [`v3`](https://github.com/src-d/go-git/tree/v3) which is being used in production at [source{d}](http://sourced.tech) since August 2015 to analyze all GitHub public repositories (i.e. 16M repositories).
+*git* is a humongous project with years of development by thousands of contributors, making it challenging for *go-git* implement all the features. You can find a comparison of *go-git* vs *git* in the [compatibility documentation](COMPATIBILITY.md).
 
-We recommend the use of `v4` to develop new projects since it includes much new functionality and provides a more *idiomatic git* API
 
 Installation
 ------------
@@ -23,6 +24,7 @@ The recommended way to install *go-git* is:
 go get -u gopkg.in/src-d/go-git.v4/...
 ```
 
+> We use [gopkg.in](http://labix.org/gopkg.in) for having a versioned API, this means that when `go get` clones the package, is the latest tag matching `v4.*` cloned and not the master branch.
 
 Examples
 --------
@@ -108,20 +110,14 @@ Date:   Fri Nov 11 13:23:22 2016 +0100
 ...
 ```
 
-You can find this [example](_examples/log/main.go) and many other at the [examples](_examples) folder
-
-Comparison With Git
--------------------
-
-In the [compatibility documentation](COMPATIBILITY.md) you can find a comparison
-table of git with go-git.
+You can find this [example](_examples/log/main.go) and many others at the [examples](_examples) folder
 
 Contribute
 ----------
 
-If you are interested in contributing to go-git, open an [issue](https://github.com/src-d/go-git/issues) explaining which missing functionality you want to work on, and we will guide you through the implementation.
+[Contributions](https://github.com/src-d/go-git/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22) are more than welcome, if you are interested please take a look to
+our [Contributing Guidelines](CONTRIBUTING.md).
 
 License
 -------
-
-MIT, see [LICENSE](LICENSE)
+Apache License Version 2.0, see [LICENSE](LICENSE)