2.14.0 --> 2.15.0 is not semver-minor.

[lexon0011]

After updating gulp-rollup from 2.14.0 to 2.15.0 I get the following error:

'Unexpected key \'sourceMap\' found, expected one of: acorn, amd, banner, cache, context, entry, exports, extend, external, file, footer, format, globals, indent, input, interop, intro, legacy, moduleContext, name, noConflict, onwarn, output, outro, paths, plugins, preferConst, pureExternalModules, sourcemap, sourcemapFile, strict, targets, treeshake, watch'

Screenshot:

After rollback to the version 2.14.0 the rollup finished successfully.

[lemmabit]

This is the same as #63 and lemmabit/rollup-stream#19. I failed to uphold semver in this update because Rollup changed the API in a breaking way. I've been too busy to fix it; sorry.

I'm going to leave this open because the issue should be documented in both repositories.