[ruby/un] Bump version to 0.2.0

https://github.com/ruby/un/commit/104bc10c57
2021-09-10 19:25:06 +09:00 · 2021-09-10 19:25:06 +09:00 · a6459081bc
--- a/lib/un.gemspec
+++ b/lib/un.gemspec
@ -2,7 +2,7 @@

 Gem::Specification.new do |spec|
  spec.name          = "un"
-  spec.version       = "0.1.0"
+  spec.version       = "0.2.0"
  spec.authors       = ["WATANABE Hirofumi"]
  spec.email         = ["eban@ruby-lang.org"]