Use recent packaging style

rubygem-kramdown.spec

@@ -3,7 +3,7 @@
 
 Name: rubygem-%{gem_name}
 Version: 2.3.0
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: Fast, pure-Ruby Markdown-superset converter
 
 License:	MIT
@@ -48,13 +48,12 @@ BuildArch:	noarch
 Documentation for %{name}
 
 %prep
-gem unpack %{SOURCE0}
-%setup -q -D -T -n  %{gem_name}-%{version}
+%setup -q -n %{gem_name}-%{version}
 %patch2 -p1
-gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
+mv ../%{gem_name}-%{version}.gemspec .
 
 %build
-gem build %{gem_name}.gemspec
+gem build %{gem_name}-%{version}.gemspec
 %gem_install
 
 %install
@@ -110,6 +109,9 @@ popd
 %doc	%{gem_docdir}
 
 %changelog
+* Tue Feb 16 2021 Mamoru TASAKA <mtasaka@fedoraproject.org> - 2.3.0-2
+- Use recent packaging style
+
 * Mon Feb  1 2021 Mamoru TASAKA <mtasaka@fedoraproject.org> - 2.3.0-1
 - 2.3.0
 - Speficy rouge version dependency for test suite