Update README install/description.

List correct package in installation instructions and provide updated description,
clarifying `%matplotlib inline` magic isn't needed anymore in default clients.

Author: fperez

README.md

@@ -1,22 +1,26 @@
 # Matplotlib Inline Back-end for IPython and Jupyter
 
+This package provides support for matplotlib to display figures directly inline in the Jupyter notebook and related clients, as shown below.
+
 ## Installation
 
 With conda:
 
 ```bash
-conda install -c conda-forge notebook matplotlib
+conda install -c conda-forge matplotlib-inline
 ```
 
 With pip:
 
 ```bash
-pip install notebook matplotlib
+pip install matplotlib-inline
 ```
 
 ## Usage
 
-This package is included in IPython and can be used in a Jupyter Notebook:
+Note that in current versions of JupyterLab and Jupyter Notebook, the explicit use of the `%matplotlib inline` directive is not needed anymore, though other third-party clients may still require it.
+
+This will produce a figure immediately below:
 
 ```python
 %matplotlib inline
@@ -28,3 +32,7 @@ x = np.linspace(0, 3*np.pi, 500)
 plt.plot(x, np.sin(x**2))
 plt.title('A simple chirp');
 ```
+
+## License
+
+Licensed under the terms of the BSD 3-Clause License, by the IPython Development Team (see `LICENSE` file).