Update README.rst

Author: rcervinoucm

README.rst

@@ -50,7 +50,7 @@ This should automatically install all dependencies (NOTE: this may take some tim
 Developers
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-Any person willing to contribute to the package must follow the ctapipe developer guidelines that can be found `here <https://ctapipe.readthedocs.io/en/latest/developer-guide/getting-started.html >`.
+Any person willing to contribute to the package must follow the ctapipe developer guidelines that can be found `here <https://ctapipe.readthedocs.io/en/latest/developer-guide/getting-started.html>`_.
 
 Links
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