Fix module namespaces

[diegoamc]

These files are still using old namespaces:

• [ ] https://github.com/mezuro/kolekti_cc_phpmd/blob/master/kolekti_cc_phpmd.gemspec
• [ ] https://github.com/mezuro/kolekti_cc_phpmd/blob/master/lib/kolekti/cc_phpmd.rb
• [ ] https://github.com/mezuro/kolekti_cc_phpmd/blob/master/lib/kolekti/cc_phpmd/version.rb
• [ ] https://github.com/mezuro/kolekti_cc_phpmd/blob/master/spec/kolekti/cc_phpmd_spec.rb

Fix them to use the new namespace (Kolekti::CcPhpMd).