Update README.md

README.md

@@ -4,7 +4,7 @@ Location, size, and type of electricity generation plants and transmission lines
 
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+[![GitLab License](https://img.shields.io/gitlab/license/fact%2Fdata%2FFACT_power?gitlab_url=https%3A%2F%2Fgit.nilu.no&style=flat&color=orange)](https://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
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