Change the format of NEWS.md

It's just my preference these days

Author: k0kubun

NEWS.md

@@ -2,27 +2,27 @@
 
 ## Unreleased
 
-- Drop deprecated `-S` option from `erb` command
+* Drop deprecated `-S` option from `erb` command
 
 ## 3.0.0
 
-- Bump `required_ruby_version` to Ruby 2.7+ [#23](https://github.com/ruby/erb/pull/23)
-- `ERB::Util.url_encode` uses a native implementation [#23](https://github.com/ruby/erb/pull/23)
-- Fix a bug that a magic comment with a wrong format could be detected [#6](https://github.com/ruby/erb/pull/6)
+* Bump `required_ruby_version` to Ruby 2.7+ [#23](https://github.com/ruby/erb/pull/23)
+* `ERB::Util.url_encode` uses a native implementation [#23](https://github.com/ruby/erb/pull/23)
+* Fix a bug that a magic comment with a wrong format could be detected [#6](https://github.com/ruby/erb/pull/6)
 
 ## 2.2.3
 
-- Bump `required_ruby_version` from 2.3 to 2.5 as it has never been supported [#3](https://github.com/ruby/erb/pull/3)
+* Bump `required_ruby_version` from 2.3 to 2.5 as it has never been supported [#3](https://github.com/ruby/erb/pull/3)
 
 ## 2.2.2
 
-- `ERB.version` returns just a version number
-- `ERB::Revision` is deprecated
+* `ERB.version` returns just a version number
+* `ERB::Revision` is deprecated
 
 ## 2.2.1
 
-- `ERB#initialize` warns `safe_level` and later arguments even without -w
+* `ERB#initialize` warns `safe_level` and later arguments even without -w
 
 ## 2.2.0
 
-- Ruby 3.0 promoted ERB to a default gem
+* Ruby 3.0 promoted ERB to a default gem