Update README.md

Author: erikap

README.md

@@ -8,7 +8,7 @@ Configure your entrypoint through the environment variable `APP_ENTRYPOINT` (def
 
 ## Example Dockerfile
 
-    FROM semtech/mu-ruby-template:2.5.0-ruby2.3
+    FROM semtech/mu-ruby-template:2.6.0-ruby2.3
     MAINTAINER Erika Pauwels <erika.pauwels@gmail.com>
     # ONBUILD of mu-ruby-template takes care of everything
 
@@ -27,7 +27,7 @@ To use the template while developing your app, start a container in development
 
     docker run --volume /path/to/your/code:/app
                 -e RACK_ENV=development
-	        -d semtech/mu-ruby-template:2.5.0-ruby2.3
+	        -d semtech/mu-ruby-template:2.6.0-ruby2.3
 
 Changes will be automatically picked up by Sinatra.
 
@@ -120,7 +120,7 @@ To run the tests while developing, start an interactive container in the test en
 
     docker run --volume /path/to/your/code:/app
                 -e RACK_ENV=test
-                -it semtech/mu-ruby-template:2.5.0-ruby2.3 /bin/bash
+                -it semtech/mu-ruby-template:2.6.0-ruby2.3 /bin/bash
 
 You can now run your tests inside the container with: