update the readme - at least some parts (#1734)

README.md

@@ -1,5 +1,5 @@
-[![CI pipeline](https://github.com/ShiftLeftSecurity/codepropertygraph/actions/workflows/push.yml/badge.svg)](https://github.com/ShiftLeftSecurity/codepropertygraph/actions/workflows/push.yml)
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.shiftleft/codepropertygraph_2.13/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.shiftleft/codepropertygraph_2.13)
+[![CI pipeline](https://github.com/ShiftLeftSecurity/codepropertygraph/actions/workflows/release.yml/badge.svg)](https://github.com/ShiftLeftSecurity/codepropertygraph/actions/workflows/release.yml)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/io.shiftleft/codepropertygraph_3/badge.svg)](https://maven-badges.herokuapp.com/maven-central/io.shiftleft/codepropertygraph_3)
 
 # Code Property Graph - Specification and Tooling
 
@@ -47,13 +47,6 @@ Additional build-time dependencies are automatically downloaded as
 part of the build process. To build and install into your local Maven
 cache, issue the command `sbt clean test publishM2`.
 
-This repo cross-compiles to Scala 2.13.x and 3.x. The default version is
-Scala 3.x which means all sbt commands will compile using Scala 3.x.
-If you want to run an sbt command for both versions you need to prefix
-it with a "+" like `sbt +test`. If you use an open sbt shell you can
-switch the default compiler version for the duration of the shell session with `++` e.g., 
-`++2.13.7` and `++3.1.0`.
-
 # Code style
 
 Code style is automatically verified by [scalafmt](https://github.com/scalameta/scalafmt)