[PATCH] Fix typos in CONTRIBUTING.md

[Lukas Fleischer]

On Mon, 13 Jul 2020 at 11:05:37, Frédéric Mangano-Tarumi wrote:
> ---
>  CONTRIBUTING.md | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)

Merged, thanks!