Check the license string

• check if the license is unknown (see #92).
• check if license is valid. Example BSD should fail as valid BSD licenses are BSD 3-Clause and BSD 2-Clause. (See source https://opensource.org/licenses/alphabetical.)

[goanpeca]

How about:

• Checking the order, some people use 3-Clause BSD
• Also it seems the use of the word license is discouraged, so if found in the string the linter should warn

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Question:

What are all the valid licenses strings for use that you can think of?, is this specified somewhere?

[ocefpaf]

It would make the linter overly strict to check for the string. We should be flexible to accept things like New BSD and BSD 3-Clause.