Update CONTRIBUTING.md (#1886)

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Sanders Lin 2020-04-18 02:03:36 +08:00 committed by GitHub
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@ -138,7 +138,7 @@ We want your work to be readable by others; therefore, we encourage you to note
The use of [Python type hints](https://docs.python.org/3/library/typing.html) is encouraged for function parameters and return values. Our automated testing will run [mypy](http://mypy-lang.org) so run that locally before making your submission.
```python
def sum_ab(a: int, b: int) --> int:
def sum_ab(a: int, b: int) -> int:
return a + b
```