create_migration method def changed to create_letsrate_migration to avoid collision with rails create_migration method name

create_migration method def changed to create_letsrate_migration to avoid collision with rails create_migration method name
/Users/jnaadjie/.rvm/gems/ruby-2.1.1@bleedingedge/gems/letsrate-1.0.9/lib/generators/letsrate/letsrate_generator.rb:37:in `create_migration': wrong number of arguments (3 for 0) (ArgumentError)
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/railties-4.1.0/lib/rails/generators/migration.rb:63:in `migration_template'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@bleedingedge/gems/letsrate-1.0.9/lib/generators/letsrate/letsrate_generator.rb:33:in `create_cacheable_migration'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/command.rb:27:in `run'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `block in invoke_all'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `each'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `map'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `invoke_all'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/group.rb:232:in `dispatch'
	from /Users/jnaadjie/.rvm/gems/ruby-2.1.1@global/gems/thor-0.19.1/lib/thor/base.rb:440:in `start'