fix metadata, add doi badge

.zenodo.json

+{
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+        "schema:email": "cboettig@gmail.com",
+        "schema:familyName": "Boettiger",
+        "schema:givenName": "Carl"
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+        "schema:familyName": "Eddelbuettel",
+        "schema:givenName": "Dirk"
+      }
+    ]
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+  },
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+  "id": {
+    "@id": "rocker-versioned"
+  },
+  "keywords": [
+    "docker",
+    "R",
+    "rocker",
+    "reproducibility",
+    "containers"
+  ],
+  "license": {
+    "@id": "https://spdx.org/licenses/GPL-2.0"
+  },
+  "name": "rocker-versioned: Versioned stack of Docker images for R",
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+  "codemeta:readme": {
+    "@id": "https://github.com/rocker-org/rocker-versioned/blob/master/README.md"
+  }
+}
\ No newline at end of file

README.md

-[![CircleCI](https://circleci.com/gh/rocker-org/rocker-versioned.svg?style=svg)](https://circleci.com/gh/rocker-org/rocker-versioned) [![license](https://img.shields.io/badge/license-GPLv2-blue.svg)](https://opensource.org/licenses/GPL-2.0)
+[![CircleCI](https://circleci.com/gh/rocker-org/rocker-versioned.svg?style=svg)](https://circleci.com/gh/rocker-org/rocker-versioned)
+[![license](https://img.shields.io/badge/license-GPLv2-blue.svg)](https://opensource.org/licenses/GPL-2.0)
 [![Project Status: Active – The project has reached a stable, usable state and is being actively developed.](http://www.repostatus.org/badges/latest/active.svg)](http://www.repostatus.org/#active)
+[![DOI](https://zenodo.org/badge/25048007.svg)](https://zenodo.org/badge/latestdoi/25048007)
+
+
 
 ## Version-stable Rocker images
 

codemeta.json

 {
   "@context": "https://raw.githubusercontent.com/codemeta/codemeta/master/codemeta.jsonld",
+  "@id": "https://doi.org/10.5281/zenodo.802967",
   "@type": "SoftwareSourceCode",
   "identifier": "rocker-versioned",
   "description": "rocker-versioned provides Dockerfiles for versioned instances of R.  The rocker-versioned stack includes base R (rocker/r-ver), RStudio, tidyverse, and verse images for various versions of R. See repository readme for the more details.",
@@ -16,7 +17,7 @@
   "provider": {
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     "url": "https://hub.docker.com/",
-    "name": "Docker Hub",
+    "name": "Docker Hub"
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