bump version in docs

Author: lukaszwawrzyk

docs/docs/installation.md

@@ -109,7 +109,7 @@ Bazel Steward is published to Maven Central under `org.virtuslab:bazel-steward`.
 To easily run it, use [Coursier](https://get-coursier.io/docs/cli-installation).
 
 ```
-coursier launch org.virtuslab:bazel-steward:1.5.0 --main org.virtuslab.bazelsteward.app.Main -- --help
+coursier launch org.virtuslab:bazel-steward:1.6.0 --main org.virtuslab.bazelsteward.app.Main -- --help
 ```
 
 ## GitHub Releases

docs/index.md

@@ -78,7 +78,7 @@ This was the most basic guide on Bazel Steward. To learn more about configuratio
 You can give Bazel Steward a quick try by running following command from the root of your Bazel workspace:
 
 ```
-coursier launch org.virtuslab:bazel-steward:1.5.2 --main org.virtuslab.bazelsteward.app.Main -- --no-remote --analyze-only
+coursier launch org.virtuslab:bazel-steward:1.6.0 --main org.virtuslab.bazelsteward.app.Main -- --no-remote --analyze-only
 ```
 
 It will show you all outdated dependencies in your project and versions that Bazel Steward suggests to use with its default config.