sslmate 0.4.3 (new formula)

SSLMate is a program for buying and managing SSL certificates from the command line.
Can this test be modified to do something more substantial than e.g. `--version` or `--help`? See `cmake.rb` for an example of an application formula with a good test and `tinyxml2.rb` for an example of a library formula with a good test. Thanks!