Update README with latest version information

README.md

@@ -264,9 +264,15 @@ This project uses a semver-parsable X.0.Z version number for releases, where X i
 Non-release versions of this project (for example on github.com/RuntimeTools/SwiftMetrics) will use semver-parsable X.0.Z-dev.B version numbers, where X.0.Z is the last release with Z incremented and B is an integer. For further information on the development process go to the  [SwiftMetrics wiki][1]: [Developing](https://github.com/RuntimeTools/SwiftMetrics/wiki/Developing).
 
 ## Version
-1.0.2
+1.2.3
 
 ## Release History
+`1.2.3` - Dependency updates, graph resizing and Swift 4 support.  
+`1.2.2` - Minor fixes.  
+`1.2.1` - Minor fixes.  
+`1.2.0` - Improvements to testing.  
+`1.1.0` - Add WSS support.  
+`1.0.3` - Swift 3.1.1 support (including dashboard).  
 `1.0.2` - Initial Swift 3.1 support (SwiftMetricsDash not working on 3.1).  
 `1.0.0` - First GA release.  
 `0.0.12` - BlueMix AutoScaling support.