README.md add missing comma

jhu-lcsr · Oct 6, 2020 · a407f48 · a407f48
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@@ -8,7 +8,7 @@ Click the image to watch the video:
 
 ## Paper, Abstract, and Citations
 
-[Good Robot! Paper on IEEE Xplore](http://doi.org/10.1109/LRA.2020.3015448)
+[Good Robot! Paper on IEEE Xplore](http://doi.org/10.1109/LRA.2020.3015448), 
 [Good Robot! Paper on ArXiV](https://arxiv.org/abs/1909.11730)
 
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