Added doc for dokku 0.4.x

Author: jazzzz

README.md

@@ -9,14 +9,24 @@ This is mostly useful for instances where you have an app that depends on packag
 ## Installation
 
 On your dokku server:
+
+### dokku >= 0.4.0
+```sh
+sudo dokku plugin:install https://github.com/F4-Group/dokku-apt
+```
+
+### dokku < 0.4.0
+
 ```sh
-git clone https://github.com/F4-Group/dokku-apt /var/lib/dokku/plugins/dokku-apt
+git clone https://github.com/F4-Group/dokku-apt -b 0.3.0 /var/lib/dokku/plugins/dokku-apt
 dokku plugins-install
 ```
 
+## Usage
+
 When you deploy your project, the dokku-apt plugin will install according to your project's `apt-repositories` and `apt-packages` files. You should store these files in your projects root as the docker container will copy your project to its /app directory. This is where the dokku-apt plugin looks for `apt-repositories` and `apt-packages`.
 
-## apt-packages
+### apt-packages
 This file should contain apt packages to install, accepts multiple packages per line, and multiple lines.
 
 Example:
@@ -25,7 +35,7 @@ nginx
 unifont
 ```
 
-## apt-repositories
+### apt-repositories
 Optional file that should contain additional APT repositories to configure to find packages.
 Requires an empty line at end of file.
 
@@ -35,7 +45,7 @@ ppa:nginx/stable
 deb http://archive.ubuntu.com/ubuntu quantal multiverse
 ```
 
-## apt-debconf
+### apt-debconf
 Optional file allowing to configure package installation. Use case is mainly for EULA (like ttf-mscorefonts-installer).
 Requires an empty line at end of file.
 
@@ -44,7 +54,7 @@ Example:
 ttf-mscorefonts-installer msttcorefonts/accepted-mscorefonts-eula select true
 ```
 
-## dpkg-packages
+### dpkg-packages
 Optional directory holding `.deb` packages to be installed automatically
 after `apt-packages`, `apt-repositories` and `apt-debconf`. Allows the
 installation of custom packages inside the container.