Update README.md

Author: philipwindecker

README.md

@@ -7,7 +7,7 @@ The Open Simulation Interface <sup>[[1]](https://www.hot.ei.tum.de/forschung/aut
 
 As the complexity of automated driving functions rapidly increases, the requirements for test and development methods are growing. Testing in virtual environments offers the advantage of completely controlled and reproducible environment conditions.
 
-For more information on OSI see the [official documentation]https://opensimulationinterface.github.io/osi-antora-generator/asamosi/latest/specification/index.html) or the [class list](https://opensimulationinterface.github.io/osi-antora-generator/asamosi/latest/gen/annotated.html) for defined protobuf messages.
+For more information on OSI see the [official documentation](https://opensimulationinterface.github.io/osi-antora-generator/asamosi/latest/specification/index.html) or the [class list](https://opensimulationinterface.github.io/osi-antora-generator/asamosi/latest/gen/annotated.html) for defined protobuf messages.
 
 [1] Hanke, T., Hirsenkorn, N., van-Driesten, C., Garcia-Ramos, P., Schiementz, M., Schneider, S. & Biebl, E. (2017, February 03). *A generic interface for the environment perception of automated driving functions in virtual scenarios.* Retrieved January 25, 2020, from https://www.hot.ei.tum.de/forschung/automotive-veroeffentlichungen/