misra-docker-images/builders.sh: Print docker version

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ia0e2d20ef53f794bfcaf4321e08b5c3a944910c9
diff --git a/misra-docker-images/builders.sh b/misra-docker-images/builders.sh
index 396e62c..a6636f6 100644
--- a/misra-docker-images/builders.sh
+++ b/misra-docker-images/builders.sh
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+docker --version
+
 if ! type aws
 then
     sudo apt-get -y -qq update