Update launchy dependency to ~> 3.0

Author: sferik

t.gemspec

@@ -7,7 +7,7 @@ require "t/version"
 Gem::Specification.new do |spec|
   spec.add_dependency "geokit", "~> 1.9"
   spec.add_dependency "htmlentities", "~> 4.3"
-  spec.add_dependency "launchy", "~> 2.4"
+  spec.add_dependency "launchy", "~> 3.0"
   spec.add_dependency "oauth", "~> 1.1"
   spec.add_dependency "retryable", "~> 3.0"
   spec.add_dependency "thor", "~> 1.3"