Update more usage docs to v2.1.1

Author: dwijnand

README.md

@@ -11,7 +11,7 @@ To use this library, add the following to your build.sbt:
 libraryDependencies += "org.scala-lang.modules" %% "scala-collection-compat" % "2.1.1"
 ```
 
-Version 2.0.0 is compatible with Scala 2.13, 2.12, and 2.11.
+Version 2.0.0+ is compatible with Scala 2.13, 2.12, and 2.11.
 
 Note that there are multiple ways to cross-build projects, see https://github.com/scala/collection-strawman/wiki/FAQ#how-do-i-cross-build-my-project-against-scala-212-and-scala-213.
 
@@ -53,7 +53,7 @@ The `Collection213Upgrade` rewrite upgrades to the 2.13 collections without the
 
 ```scala
 // build.sbt
-scalafixDependencies in ThisBuild += "org.scala-lang.modules" %% "scala-collection-migrations" % "2.0.0"
+scalafixDependencies in ThisBuild += "org.scala-lang.modules" %% "scala-collection-migrations" % "2.1.1"
 scalacOptions ++= List("-Yrangepos", "-P:semanticdb:synthetics:on")
 ```
 
@@ -71,8 +71,8 @@ To cross-build for 2.12 and 2.11, the rewrite rule introduces a dependency on th
 
 ```scala
 // build.sbt
-scalafixDependencies in ThisBuild += "org.scala-lang.modules" %% "scala-collection-migrations" % "2.0.0"
-libraryDependencies +=  "org.scala-lang.modules" %% "scala-collection-compat" % "2.0.0"
+scalafixDependencies in ThisBuild += "org.scala-lang.modules" %% "scala-collection-migrations" % "2.1.1"
+libraryDependencies +=  "org.scala-lang.modules" %% "scala-collection-compat" % "2.1.1"
 scalacOptions ++= List("-Yrangepos", "-P:semanticdb:synthetics:on")
 ```