RFC-6838: parameter should not be specified more than once

[g4s8]

According to Parameter Requirements:

It is an error for a specific parameter to be specified more than once.

So lets change params() signature of MimeType from Map<String, List<String>> to
Map<String, String>. If parameter specified more than once params() should throw an exception.

[Viciouss]

Hi, I'd like to work on this. Is an IllegalStateException okay for this purpose?

[g4s8]

Hi @Viciouss! Thanks for contributing. I'll look at your PR soon. About exception: it would be better to use checked one here, you can take IOException or another extended from IOException.

[0crat]

Oops! Job gh:g4s8/mime#3 was not in scope

[g4s8]

@Viciouss thanks!

[g4s8]

@rultor release, tag=0.2

[rultor]

@rultor release, tag=0.2

@g4s8 OK, I will release it now. Please check the progress here

[rultor]

@rultor release, tag=0.2

@g4s8 Done! FYI, the full log is here (took me 2min)