[ruby/pp] Bump version to 0.3.0

https://github.com/ruby/pp/commit/c66d1b9cdc
2021-12-20 12:43:49 +09:00 · 2021-12-20 12:43:49 +09:00 · 0a198e4238
--- a/lib/pp.gemspec
+++ b/lib/pp.gemspec
@ -1,6 +1,6 @@
 Gem::Specification.new do |spec|
  spec.name          = "pp"
-  spec.version       = "0.2.1"
+  spec.version       = "0.3.0"
  spec.authors       = ["Tanaka Akira"]
  spec.email         = ["akr@fsij.org"]