Update README

![Poet Install](https://raw.githubusercontent.com/sdispater/poetry/master/assets/install.gif)

The package is **highly experimental** at the moment so expect things to change and break.

However, if you feel adventurous feedback and pull requests are greatly appreciated.

Also, be aware that the features described here are the goal that this library is aiming

for and, as of now, not all of them are implemented (but most of them are).

The dependency management is done while the packaging and publishing are still at the beginning.

## Installation

Poetry provides a custom installer that will install `poetry` isolated

from the rest of your system by vendorizing its dependencies. This is the

recommended way of installing `poetry`.

```bash

pip install poetry

curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python

```

Alternatively, you can download the `get-poetry.py` file and execute it separately.

If you want to install prerelease versions, you can do so by passing `--preview` to `get-poetry.py`:

```bash

python get-poetry.py --preview

```

Similarly, if you want to install a specific version, you can use `--version`:

```bash

python get-poetry.py --version 0.7.0

```

Using `pip` to install `poetry` is also possible.

```bash

pip install --user poetry

``` 

Be aware, however, that it will also install poetry's dependencies

which might cause conflicts.

### Enable tab completion for Bash, Fish, or Zsh

`poetry` supports generating completion scripts for Bash, Fish, and Zsh.