updated badges in Readme

Replaced nonworking LGTM badges with new ones

README.md

@@ -1,6 +1,6 @@
 # Dobby
-
-[![Total alerts](https://img.shields.io/lgtm/alerts/g/rdkcentral/Dobby.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/rdkcentral/Dobby/alerts/) [![Language grade: C/C++](https://img.shields.io/lgtm/grade/cpp/g/rdkcentral/Dobby.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/rdkcentral/Dobby/context:cpp)
+![GitHub release (with filter)](https://img.shields.io/github/v/release/rdkcentral/Dobby)![GitHub](https://img.shields.io/github/license/rdkcentral/Dobby)![Github](https://img.shields.io/github/issues-pr-raw/rdkcentral/Dobby)![Github](https://img.shields.io/github/issues/rdkcentral/Dobby)
+  
 
 Dobby “Docker based Thingy” is a tool for managing and running OCI containers using [crun](https://github.com/containers/crun)