gemspec: fix license

Author: bastelfreak

puppet-lint-strict_indent-check.gemspec

@@ -2,7 +2,7 @@ Gem::Specification.new do |spec|
   spec.name = 'puppet-lint-strict_indent-check'
   spec.version     = '2.1.0'
   spec.homepage    = 'https://github.com/voxpupuli/puppet-lint-strict_indent-check'
-  spec.license     = 'Mozilla 2.0'
+  spec.license     = 'MPL-2.0'
   spec.author      = 'Vox Pupuli'
   spec.email       = '[email protected]'
   spec.files       = Dir[