CONTRIBUTION.md is not formatted properly

[aqib-ilyas]

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Issues and steps to reproduce

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-If you are an individual writing original source code and you're sure you own the intellectual property, then you'll need to sign an [individual CLA] (https://cla.developers.google.com).
-If you work for a company that wants to allow you to contribute your work, then you'll need to sign a [corporate CLA] (https://cla.developers.google.com).
-Ensure that your code adheres to the existing style in the sample to which you are contributing. Refer to the [Android Code Style Guide] (https://source.android.com/source/code-style.html) for the recommended coding standards for this organization.

Expected behavior

-If you are an individual writing original source code and you're sure you own the intellectual property, then you'll need to sign an individual CLA.
-If you work for a company that wants to allow you to contribute your work, then you'll need to sign a corporate CLA.
-Ensure that your code adheres to the existing style in the sample to which you are contributing. Refer to the Android Code Style Guide for the recommended coding standards for this organization.

Version of the flexbox library

e.g. 3.0.0