FAB-5154 update prereqs to Docker 17.03.0-ce

Change-Id: I34d23137eebfd9d5697061c1bf813b83543bcd05
Signed-off-by: Christopher Ferris <chrisfer@us.ibm.com>

Author: christo4ferris

docs/source/prereqs.rst

@@ -17,10 +17,10 @@ You will need the following installed on the platform on which you will be
 operating, or developing on (or for), Hyperledger Fabric:
 
   - MacOSX, *nix, or Windows 10: `Docker <https://www.docker.com/products/overview>`__
-    v1.12 or greater is required.
+    Docker version 17.03.0-ce or greater is required.
   - Older versions of Windows: `Docker
     Toolbox <https://docs.docker.com/toolbox/toolbox_install_windows/>`__ -
-    again, Docker version v1.12 or greater is required.
+    again, Docker version Docker 17.03.0-ce or greater is required.
 
 You can check the version of Docker you have installed with the following
 command from a terminal prompt: