mailshears.gemspec: use SPDX license identifier

diff --git a/mailshears.gemspec b/mailshears.gemspec
index 3eb3da9fd248d7925673a057a0fce9d561d68f0b..72d9cd4f6f5bc8e3ff435638995d8fd93db5ce21 100644 (file)
--- a/mailshears.gemspec
+++ b/mailshears.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
     as well. Since these two tasks are related, mailshears does them both.
   EOF
 
-  s.license           = 'AGPL-3.0'
+  s.license           = 'AGPL-3.0-or-later'
   s.required_rubygems_version = '>= 1.3.6'
 
   # If you have runtime dependencies, add them here