README.md in armg-0.8.1 vs README.md in armg-0.9.0

@@ -1,12 +1,13 @@
 # Armg
 
 Add MySQL geometry type to Active Record.
 
 [![Gem Version](https://badge.fury.io/rb/armg.svg)](https://badge.fury.io/rb/armg)
-[![Build Status](https://travis-ci.org/winebarrel/armg.svg?branch=master)](https://travis-ci.org/winebarrel/armg)
+[![Build Status](https://github.com/winebarrel/armg/workflows/test/badge.svg?branch=master)](https://github.com/winebarrel/armg/actions)
 
+
 ## Installation
 
 Add this line to your application's Gemfile:
 
 ```ruby
@@ -117,20 +118,25 @@
 
 You need to extend the TableDefinition class.
 
 ```ruby
 # ridgepole-geo.rb
-module Ridgepole
-  class DSLParser
-    class TableDefinition
-      def geometry(*args)
-        options = args.extract_options!
-        column_names = args
-        column_names.each { |name| column(name, :geometry, options) }
-      end
-    end
+module TableDefinitionExtForGeometry
+  def geometry(*args)
+    options = args.extract_options!
+    column_names = args
+    column_names.each { |name| column(name, :geometry, options) }
   end
 end
+Ridgepole::DSLParser::TableDefinition.prepend(TableDefinitionExtForGeometry)
+
+module DiffExtForGeometry
+  def normalize_index_options!(opts)
+    super
+    opts.delete(:length) if opts[:type] == :spatial
+  end
+end
+Ridgepole::Diff.prepend(DiffExtForGeometry)
 ```
 
 ```sh
 $ ridgepole -c 'mysql2://root@127.0.0.1:10057/armg_test' -r armg -e > Schemafile