(MAINT) Correct supported versions & platforms

This commit removes the specification of minimum required Puppet
Enterprise version from the Setup Requirements section of the
readme. It does so both because this information already exists
in the metadata.json and because the forge prominently displays
compatible versions.

This commit also adds Windows Server 2016 as a supported option
in the same section of the readme since this is also specified
in the metadata.json file.

Author: michaeltlombardi

README.md

@@ -32,10 +32,9 @@ Microsoft SQL Server is a database platform for Windows. The sqlserver module le
 
 The sqlserver module requires the following:
 
-* Puppet Enterprise 3.7 or later.
 * .NET 3.5. (Installed automatically if not present. This might require an internet connection.)
 * The contents of the SQL Server ISO file, mounted or extracted either locally or on a network share.
-* Windows Server 2012 or 2012 R2.
+* Windows Server 2012, 2012 R2, or 2016.
 
 ### Beginning with sqlserver