Update README.md (#219)

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# PR Details
Update Readme.md to point release history of Carma-software
## Description

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- [ ] I have added any new packages to the sonar-scanner.properties file
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README.md

@@ -4,7 +4,9 @@
 # CARMASimulation
 This repository will host the CARMA Everything-in-the-Loop Co-Simulation tool. This XiL simulation platform will support CARLA and SUMO simulation environments as a co-simulation using the MOSAIC framework to facilitate coordination and data exchange. This co-simulation environment will also utilize NS-3 to simulate the communications used by the C-ADS systems.
 
-The current version and release history can be found here: [Release Notes](<docs/Release_notes.md>)
+## Release Notes
+The current version and release history can be found here: [Release Notes](https://github.com/usdot-fhwa-stol/carma-platform/blob/master/docs/Release_notes.md)
+
 ## Contribution
 Welcome to the CARMA contributing guide. Please read this guide to learn about our development process, how to propose pull requests and improvements, and how to build and test your changes to this project. [CARMA Contributing Guide](https://github.com/usdot-fhwa-stol/carma-platform/blob/develop/Contributing.md)