Update README for 3.0.0 release

Author: migesok

README.md

@@ -43,7 +43,7 @@ val stateBefore: Future[Int] = sequentially(()) {
 
 The project supports the Pekko implementation. To use it, add the suffix '-pekko' to the artefact name. For example, 
 ```scala
-libraryDependencies += "com.evolutiongaming" %% "sequentially-pekko" % "2.0.0"
+libraryDependencies += "com.evolutiongaming" %% "sequentially-pekko" % "3.0.0"
 ```
 
 ## Other good stuff
@@ -77,5 +77,5 @@ And also we have mixed `TrieMap` with `Sequentially`, results can be found in
 ```scala
 addSbtPlugin("com.evolution" % "sbt-artifactory-plugin" % "0.0.2")
 
-libraryDependencies += "com.evolutiongaming" %% "sequentially" % "2.0.0"
+libraryDependencies += "com.evolutiongaming" %% "sequentially" % "3.0.0"
 ```