Update uglifyjs-webpack-plugin to the latest version 🚀

[greenkeeper]

Version 1.2.6 of uglifyjs-webpack-plugin was just published.

Dependency	[uglifyjs-webpack-plugin](https://github.com/webpack-contrib/uglifyjs-webpack-plugin)
Current Version	1.2.5
Type	devDependency

The version 1.2.6 is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

It might be worth looking into these changes and trying to get this project onto the latest version of uglifyjs-webpack-plugin.

If you have a solid test suite and good coverage, a passing build is a strong indicator that you can take advantage of these changes directly by merging the proposed change into your project. If the build fails or you don’t have such unconditional trust in your tests, this branch is a great starting point for you to work on the update.

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Release Notes

v1.2.6

1.2.6 (2018-06-20)

Bug Fixes

• disable inline optimization by default (#308) (6ab0918)
• don't use a worker farm unless more than one process is required (#280) (3f0767b)
• better handle invalid source map (#284) (dbebb3b)
• perf regression with memory usage for source maps (#305) (3ca5eaf)
• return missing important information for uglify warnings (#306) (4f50156)

Commits

The new version differs by 7 commits.

• 1521c82 chore(release): 1.2.6
• 120e4b0 docs: fix broken markdown (#315)
• 4f50156 fix: return missing important information (#306)
• 6ab0918 fix: disable inline optimization by default (#308)
• 3ca5eaf fix: perf regression (#305)
• 3f0767b fix: don't use a worker farm unless more than one process is required (#280)
• dbebb3b fix: improve isSouceMap check (#284)

See the full diff

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