```ruby
class PortMap < Cask
  url 'http://tcmportmapper.googlecode.com/files/PortMap-1.3.1-r46.zip'
  homepage 'http://www.codingmonkeys.de/portmap'
  version '1.3.1-r46'
  sha1 'bc294028f665a2e42cc32a6dc69493fd34542d8c'
  link 'Port Map.app'
end
```

Update Portmap checksum to SHA256
user
```ruby
class PortMap < Cask
  url 'http://tcmportmapper.googlecode.com/files/PortMap-1.3.1-r46.zip'
  homepage 'http://www.codingmonkeys.de/portmap'
  version '1.3.1-r46'
  sha256 '50e29f121139ee2f68ad978cb3921ef52f2dbfb5a0131c417516e4e5f1fa64af'
  link 'Port Map.app'
end
```
assistant