updated docs with getContext

Author: prateekatknoldus

Diff for: README.md

@@ -127,7 +127,12 @@ val logger = Logger.takingImplicit[CorrelationId]("test")
 logger.info("Test") // takes implicit correlationId and logs "ID Test"
 ```
 
-It's possible to use `MDC` through `CanLog` without any troubles with execution context.
+If you want to extract the context object associated with your logger i.e. `correlationId` here, use `getContext`.
+```scala
+val context = logger.canLogEv.getContext
+```
+
+It's also possible to use `MDC` through `CanLog` without any troubles with execution context.
 
 ```scala
 case class CorrelationId(value: String)