Update version in readme

Author: tsuckow

README.md

@@ -16,18 +16,18 @@ We currently support Scala `2.11, 2.12`
 <dependency>
     <groupId>net.codingwell</groupId>
     <artifactId>scala-guice_2.12</artifactId>
-    <version>4.2.1</version>
+    <version>4.2.2</version>
 </dependency>
 ```
 
 ##### sbt:
 ```scala
-"net.codingwell" %% "scala-guice" % "4.2.1"
+"net.codingwell" %% "scala-guice" % "4.2.2"
 ```
 
 ##### gradle:
 ```groovy
-'net.codingwell:scala-guice_2.12:4.2.1'
+'net.codingwell:scala-guice_2.12:4.2.2'
 ```
 
 ### Mixin