update Readme

Update to upstream 2.5.21 (akka-js#95)

* first attempt to bump to 2.5.21

* fixes to build and tests

* Update readme

* fix build

Update to2.5.19 (akka-js#93)

* stream working(possibly)

* fixes

* removing failing tests

* wip

* akka stream typed

* rem ManifestSpec

* prepare to release

Update to Akka 2.5.15

Update to Akka 2.5.14 (akka-js#87)

* first attempt to have Akka 2.5.14

* fixing akka typed

* one test is not passing

* adding stream typed

* update sbt to 1.X

* adding streamtyped to travis tests

* release and update docs

update to Akka 2.5.13 (akka-js#84)

* updating to akka 2.5.13 and shocon 0.3.1

* minor

* fixes to typed

* minor configurationfix

* removing one test

* update Readme

minor reword

update and release 1.2.5.8

preparing for release

version 1.2.5.2