add MIT license metadata to gemspec

Author: ktdreyer

Rakefile

@@ -11,6 +11,7 @@ begin
     spec.homepage = "https://github.com/nirvdrum/svn2git"
     spec.email = "[email protected]"
     spec.add_development_dependency 'test-unit'
+    spec.license 'MIT'
   end
   Jeweler::GemcutterTasks.new
 

svn2git.gemspec

@@ -34,6 +34,7 @@ Gem::Specification.new do |s|
   s.homepage = "https://github.com/nirvdrum/svn2git"
   s.rubygems_version = "2.2.2"
   s.summary = "A tool for migrating svn projects to git"
+  s.license = "MIT"
 
   if s.respond_to? :specification_version then
     s.specification_version = 4