I don't know if there is a list of "standard formatting" of license names, but I am using https://github.com/pivotal/LicenseFinder which recognizes the Apache License by the strings "apache2" and "Apache 2.0" (case insensitive). See https://github.com/pivotal/LicenseFinder/blob/master/lib/license_finder/license/apache2.rb for details. So I propose changing this line to:

```ruby
s.license = "apache2"
```