[ruby/set] Bump version to 1.0.3

ruby/set@e2419f2d30

Author: hsbt

lib/set/set.gemspec

@@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
   spec.name          = "set"
-  spec.version       = "1.0.3.dev"
+  spec.version       = "1.0.3"
   spec.authors       = ["Akinori MUSHA"]
   spec.email         = ["[email protected]"]