Merge pull request #1039 from meissnereric/patch-1

Fix typo in CONTRIBUTING.md

Author: joaquinvanschoren

CONTRIBUTING.md

@@ -14,7 +14,7 @@ We are currently looking for help with:
 * User feedback (best via GitHub issues, but email is also fine)
 * Frontend / UX / Design of the website 
 * Backend / API 
-* Outreach / making OpenML better known (especially in non-ML-communities, where people have data but no analysis experise)
+* Outreach / making OpenML better known (especially in non-ML-communities, where people have data but no analysis expertise)
 * Helping with the APIs ([Python](https://openml.github.io/OpenML/Python-start/), [R](https://openml.github.io/OpenML/R-guide/), [Java](https://openml.github.io/OpenML/Java-guide/) and [.Net](https://openml.github.io/OpenML/NET-API/); find the links to GitHub repos [here](https://github.com/openml/OpenML/wiki))
 * Helping with the integration of machine learning libraries ([WEKA](https://www.openml.org/#WEKA), [MOA](https://www.openml.org/#plugin_moa), [MLR](https://openml.github.io/OpenML/mlr/), find the links to GitHub repos [here](https://github.com/openml/OpenML/wiki))
 * Helping with documenting the interfaces or the API