Updating CONTRIBUTING.md (#1632)

CONTRIBUTING.md

@@ -1,4 +1,5 @@
 # Contributing to Polars
+
 We love your input! We want to make contributing to this project as easy and transparent as possible, whether it's:
 
 - Reporting a bug
@@ -7,6 +8,7 @@ We love your input! We want to make contributing to this project as easy and tra
 - Adding/Proposing new features
 
 ## We Develop with GitHub
+
 We use GitHub to host code, to track issues and feature requests, as well as accept pull requests.
 
 1. Fork the repo and create your branch from `master`.
@@ -17,16 +19,19 @@ We use GitHub to host code, to track issues and feature requests, as well as acc
 6. Issue that pull request!
 
 ## Want to discuss something?
+
 I can imagine that some questions don't fit an issue.
 Therefore there is also a [chat on Gitter](https://gitter.im/polars-rs/community).
 
 ## Any contributions you make will be under the MIT Software License
+
 In short, when you submit code changes, your submissions are understood to be under the same
 [MIT License](https://choosealicense.com/licenses/mit/) that covers the project.
 Feel free to contact the maintainers if that's a concern.
 
 ## Report bugs using GitHub's [issues](https://github.com/pola-rs/polars/issues)
-We use GitHub issues to track public bugs. Report a bug by [opening a new issue]().
+
+We use GitHub issues to track public bugs. Report a bug by [opening a new issue](https://github.com/pola-rs/polars/issues/new/choose).
 **Great Bug Reports** tend to have:
 
 - A quick summary and/or background
@@ -36,35 +41,40 @@ We use GitHub issues to track public bugs. Report a bug by [opening a new issue]
 - Notes (possibly including why you think this might be happening, or stuff you tried that didn't work)
 
 ## Code formatting
+
 We test the code formatting in the CI pipelines. If you don't want these to fail, you need to format:
 
-* **Rust** code with `$ cargo fmt`
-* **Python** code with [black](https://github.com/psf/black) (version 21.6b0) and [isort](https://github.com/PyCQA/isort) (version 5.9.2). Run both from the `py-polars` directory with `$ black . && isort .`
+- **Rust** code with `$ cargo fmt`
+- **Python** code with [black](https://github.com/psf/black) (version 21.6b0) and [isort](https://github.com/PyCQA/isort) (version 5.9.2). Run both from the `py-polars` directory with `$ black . && isort .`
 
 ## Linting
+
 We use linters to enforce code quality. This will be checked in CI.
 
-* **Rust** We use [clippy](https://github.com/rust-lang/rust-clippy) as linter.
-* **Python** We use [flake8](https://flake8.pycqa.org/en/latest/) as linter.
+- **Rust** We use [clippy](https://github.com/rust-lang/rust-clippy) as linter.
+- **Python** We use [flake8](https://flake8.pycqa.org/en/latest/) as linter.
 
 ## Type checking
+
 For Python, type hints are enforced using [mypy](https://github.com/python/mypy). This will be checked in CI.
 
 ## Python setup
+
 If you want to contribute to the Python code, you also have to setup a Rust installation to be able to test your changes.
 You have to follow these steps:
 
-* install rust nightly via [rustup](https://www.rust-lang.org/tools/install)
-* run `$ rustup override set nightly` from the root of the repo.
-<<<<<<< HEAD
-* `$ pip3 install maturin==0.9.4`
-* from [./py-polars](./py-polars) run `$ ./tasks.sh build-run-tests`
+- install rust nightly via [rustup](https://www.rust-lang.org/tools/install)
+- run `$ rustup override set nightly` from the root of the repo.
+- `$ pip3 install maturin==0.11.0`
+- from [./py-polars](./py-polars) run `$ make build-and-test`
 
 =======
-* from [./py-polars](./py-polars) run `$ pip3 install -r build.requirements.txt`
-* from [./py-polars](./py-polars) run `$ ./tasks.sh build-run-tests`
->>>>>>> master
+
+- from [./py-polars](./py-polars) run `$ pip3 install -r build.requirements.txt`
+- from [./py-polars](./py-polars) run `$ make build-and-test pre-commit`
+
 The last step installs a (slow) development build in your current environment and runs pytest.
 
 ## License
+
 By contributing, you agree that your contributions will be licensed under its MIT License.

py-polars/polars/lazy/expr.py

@@ -1506,7 +1506,7 @@ def rolling_apply(
     ) -> "Expr":
         """
         Allows a custom rolling window function.
-        Prefer the specific rolling window fucntions over this one, as they are faster.
+        Prefer the specific rolling window functions over this one, as they are faster.
 
         Prefer:
             * rolling_min