Update readme

README.md

@@ -1,32 +1,32 @@
 # Polars CLI
 
+![Crates.io](https://img.shields.io/crates/v/polars-cli)
+![PyPI - Version](https://img.shields.io/pypi/v/polars-cli)
+
+The Polars command line interface provides a way to easily execute SQL commands using Polars as a backend.
+
 ## Installation
 
-Until binaries are available, the only way to install the Polars CLI is by building it from source:
 
-```bash
-cargo +nightly install --locked polars-cli
-```
 
-Alternatively, clone the repository and install the latest version on the main branch:
+Until binaries are available, the only way to install the Polars CLI is by building it from source:
 
 ```bash
-cargo install --locked --path .
+cargo install --locked polars-cli
 ```
 
 #### Prerequisites
 
 1. `rustup`: which provides the `cargo` executable. You can get it from the [official website](https://rustup.rs/).
-2. `rustup install nightly` - The `nightly` version of rust, since some of our dependencies use unstable features.
 
 ## Usage
 
 ```shell
 $ polars
-Polars CLI version 0.3.0
+Polars CLI version 0.4.0
 Type .help for help.
 
->> select * FROM read_csv('examples/datasets/foods1.csv');
+>> select * FROM read_csv('examples/datasets/foods.csv');
 ┌────────────┬──────────┬────────┬──────────┐
 │ category   ┆ calories ┆ fats_g ┆ sugars_g │
 │ ---        ┆ ---      ┆ ---    ┆ ---      │