Wrong target should throw the exception

[ceremcem]

I tried to define chrome: 42 as target and bubleify didn't throw any exception. I tried to create a browserify transform on my own and pass chrome: 42 as target:

my-buble = (input) ->
    es5 = buble.transform input, do
        target:
            chrome: 42
            firefox: 44
    es5.code

bundler
    ..transform browserify-livescript 
    ..transform (file) ->
        through (buf, enc, next) ->
            content = buf.to-string \utf8
            try
                es5 = my-buble content
                @push es5
                next!
            catch
                @emit 'error', e

...and it threw the following exception:

Error: Support data exists for the following versions of chrome: 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63. Please raise an issue at https://github.com/Rich-Harris/buble/issues

so bubleify should throw the same exception.