add missing footer

Author: ThierryO

README.md

@@ -131,3 +131,5 @@ git2rdata
 ## Contributions
 
 Contributions to `git2rdata` are welcome. Please read our [Contributing guidelines](.github/CONTRIBUTING.md) first. The `git2rdata` project is released with a [Contributor Code of Conduct](.github/CODE_OF_CONDUCT.md). By contributing to this project, you agree to abide by its terms.
+
+[![ropensci_footer](http://ropensci.org/public_images/github_footer.png)](https://ropensci.org)

codemeta.json

@@ -181,7 +181,7 @@
   ],
   "releaseNotes": "https://github.com/inbo/git2rdata/blob/master/NEWS.md",
   "readme": "https://github.com/ropensci/git2rdata/blob/master/README.md",
-  "fileSize": "363.585KB",
+  "fileSize": "363.628KB",
   "contIntegration": [
     "https://travis-ci.org/inbo/git2rdata",
     "https://ci.appveyor.com/project/ThierryO/git2rdata/branch/master",