Upgrade to version 0.3 (#14)

* Add link to examples in README.md

* Bump to 0.3

README.md

@@ -14,7 +14,7 @@ Add the following to your `Cargo.toml` file:
 
 ```toml
 [dependencies]
-pgfplots = { version = "0.2", features = ["inclusive"] }
+pgfplots = { version = "0.3", features = ["inclusive"] }
 ```
 
 Plotting a quadratic function is as simple as:
@@ -33,9 +33,11 @@ plot.show()?;
 
 ## [Examples](https://github.com/DJDuque/pgfplots/tree/main/examples)
 
-Click on each image to see their source code:
+A more extensive list of examples and their source code is available in the
+`examples/` directory (runnable with
+`cargo run --all-features --example example_name`).
 
-| | | |
+|[[code]](https://github.com/DJDuque/pgfplots/blob/main/examples/fitted_line.rs)|[[code]](https://github.com/DJDuque/pgfplots/blob/main/examples/rectangle_integration.rs)|[[code]](https://github.com/DJDuque/pgfplots/blob/main/examples/snowflake.rs)|
 |-|-|-|
 |![](https://github.com/DJDuque/pgfplots/blob/main/examples/fitted_line.png)|![](https://github.com/DJDuque/pgfplots/blob/main/examples/rectangle_integration.png)|![](https://github.com/DJDuque/pgfplots/blob/main/examples/snowflake.png)|
 

examples/README.md

@@ -6,6 +6,6 @@ fully customize your plots. These take valid PGFPlots keys, which you can browse
 in the official manual. There is a set of features from LaTeX's pgfplots
 missing; please open an issue for these.
 
-| | | |
+|[[code]](https://github.com/DJDuque/pgfplots/blob/main/examples/fitted_line.rs)|[[code]](https://github.com/DJDuque/pgfplots/blob/main/examples/rectangle_integration.rs)|[[code]](https://github.com/DJDuque/pgfplots/blob/main/examples/snowflake.rs)|
 |-|-|-|
 |![](https://github.com/DJDuque/pgfplots/blob/main/examples/fitted_line.png)|![](https://github.com/DJDuque/pgfplots/blob/main/examples/rectangle_integration.png)|![](https://github.com/DJDuque/pgfplots/blob/main/examples/snowflake.png)|