Clarify licensing
Clarify licensing

The MIT license applies to my code, not the contents of `sources` which
remain under their original licenses.

chrislo/sourceclassifier,chrislo/sourceclassifier,kaushik94/sourceclassifier,kaushik94/sourceclassifier,kaushik94/sourceclassifier,kaushik94/sourceclassifier,kaushik94/sourceclassifier,chrislo/sourceclassifier,kaushik94/sourceclassifier,chrislo/sourceclassifier