Merge pull request #213 from clue-labs/rename

Rename `master` branch to `1.x` and update installation instructions

Author: SimonFrings

README.md

@@ -6,10 +6,14 @@
 
 GraPHP is the mathematical graph/network library written in PHP.
 
->   You're viewing the contents of the `master` development brach. Note that this
-    branch is subject to active development and will contain breaking changes
-    for the upcoming release. If you want to use the latest release version,
-    see also the `v0.9.x` release branch for more details.
+> **Development version:** This branch contains the code for the upcoming 1.0 release.
+> For the code of the current stable 0.9 release, check out the
+> [`0.9.x` branch](https://github.com/graphp/graph/tree/0.9.x).
+>
+> The upcoming 1.0 release will be the way forward for this package.
+> However, we will still actively support 0.9.x for those not yet
+> on the latest version.
+> See also [installation instructions](#install) for more details.
 
 **Table of contents**
 
@@ -110,10 +114,11 @@ See [graphp/algorithms](https://github.com/graphp/algorithms) for more details.
 The recommended way to install this library is [through Composer](https://getcomposer.org/).
 [New to Composer?](https://getcomposer.org/doc/00-intro.md)
 
-This will install the latest supported version:
+Once released, this project will follow [SemVer](https://semver.org/).
+At the moment, this will install the latest development version:
 
 ```bash
-$ composer require clue/graph:^0.9.3
+composer require graphp/graph:^1@dev
 ```
 
 See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
@@ -132,13 +137,13 @@ To run the test suite, you first need to clone this repo and then install all
 dependencies [through Composer](https://getcomposer.org/):
 
 ```bash
-$ composer install
+composer install
 ```
 
 To run the test suite, go to the project root and run:
 
 ```bash
-$ vendor/bin/phpunit
+vendor/bin/phpunit
 ```
 
 ## Contributing