Update strscan structure for strscan/strscan.rb

Author: hsbt

tool/sync_default_gems.rb

@@ -275,6 +275,7 @@ def sync_default_gems(gem)
     when "strscan"
       rm_rf(%w[ext/strscan test/strscan])
       cp_r("#{upstream}/ext/strscan", "ext")
+      cp_r("#{upstream}/lib", "ext/strscan")
       cp_r("#{upstream}/test/strscan", "test")
       cp_r("#{upstream}/strscan.gemspec", "ext/strscan")
       begin