Rename schema_2016 to schema_2017

Since it is our new minimum version.

Author: andyundso

README.md

@@ -443,7 +443,7 @@ Examples us using enviornment variables to customize the test task.
 
 ```
 $ rake TINYTDS_UNIT_DATASERVER=mydbserver
-$ rake TINYTDS_UNIT_DATASERVER=mydbserver TINYTDS_SCHEMA=sqlserver_2016
+$ rake TINYTDS_UNIT_DATASERVER=mydbserver TINYTDS_SCHEMA=sqlserver_2017
 $ rake TINYTDS_UNIT_HOST=mydb.host.net TINYTDS_SCHEMA=sqlserver_azure
 ```
 

test/schema/sqlserver_2016.sql renamed to test/schema/sqlserver_2017.sql

@@ -4,15 +4,15 @@
 require 'minitest/autorun'
 require 'toxiproxy'
 
-TINYTDS_SCHEMAS = ['sqlserver_2016', 'sqlserver_azure'].freeze
+TINYTDS_SCHEMAS = ['sqlserver_2017', 'sqlserver_azure'].freeze
 
 module TinyTds
   class TestCase < MiniTest::Spec
 
     class << self
 
       def current_schema
-        ENV['TINYTDS_SCHEMA'] || 'sqlserver_2016'
+        ENV['TINYTDS_SCHEMA'] || 'sqlserver_2017'
       end
 
       TINYTDS_SCHEMAS.each do |schema|