Update CONTRIBUTING.md

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@ -32,7 +32,7 @@ We discourage the following types of contributions:
In short, most code changes should either bring new features or better performance. We want to avoid unmotivated code changes.
Guidelines
General Guidelines
----------
Contributors are encouraged to :
@ -43,6 +43,20 @@ Contributors are encouraged to :
- Tools may report "problems" with the code, but we never delegate programming to tools: if there is a problem with the code, we need to understand it. Thus we will not "fix" code merely to please a static analyzer if we do not understand.
- Provide tests for any new feature. We will not merge a new feature without tests.
Pull Requests
--------------
Pull requests are always invited. However, we ask that you follow these guidelines:
- Users should provide a rationale for their changes. Does it improve performance? Does it add a feature? Does it improve maintainability? Does fix a bug? This must be explicitly stated as part of the pull request. Do not propose changes based on taste or intuition. We do not delegate programming to tools: that some tool suggested a code change is not reason enough to change the code.
1. When your code improves performance, please document the gains with a benchmark using hard numbers.
2. If your code fixes a bug, please be either fix a failing test, or propose a new test.
3. Other types of changes must be clearly motivated. We openly discourage changes with no identifiable benefits.
- Changes should be focused and minimal. You should change as few lines of code as possible. Please do not reformat or touch files needlessly.
- New features must be accompanied of new tests, in general.
- Your code should pass our continuous-integration tests. It is your responsability to ensure that your proposal pass the tests. We do not merge pull requests that would break our build.
Code of Conduct
---------------