vacancies added

vacancies.md

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 ## PhD's and Postdocs
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+We currently have two vacancies in our group:
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+- [TUD05062 Postdoc Risk-aware Autonomous Navigation](https://www.tudelft.nl/over-tu-delft/werken-bij-tu-delft/vacatures/details/?nPostingId=5637&nPostingTargetId=16502&id=QEZFK026203F3VBQBLO6G68W9&LG=UK&languageSelect=UK&mask=external)
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+- [TUD05061 Postdoc Multi-robot Mobile Manipulation in Human-Centered Environments](https://www.tudelft.nl/over-tu-delft/werken-bij-tu-delft/vacatures/details/?nPostingId=5636&nPostingTargetId=16499&id=QEZFK026203F3VBQBLO6G68W9&LG=UK&languageSelect=UK&mask=external)
+
 Applications from excellent individuals interested in a PhD or Postdoctoral position are always welcomed. Please send your CV and a motivation letter to [Javier Alonso-Mora](mailto:{{ site.contact_email }}).