coltrane.gemspec in coltrane-1.0.24 vs coltrane.gemspec in coltrane-1.0.26

@@ -12,9 +12,11 @@
   spec.summary       = %q{It deals with all sorts of calculations around music theory
                           and allows for graphical representations of it}
   spec.homepage      = "http://github.com/pedrozath/coltrane"
   spec.license       = "MIT"
 
+  spec.required_ruby_version = '~> 2.3'
+
   # Prevent pushing this gem to RubyGems.org. To allow pushes either set the 'allowed_push_host'
   # to allow pushing to a single host or delete this section to allow pushing to any host.
   if spec.respond_to?(:metadata)
     spec.metadata['allowed_push_host'] = "https://rubygems.org"
   else