Bump uglifier from 2.5.3 to 2.7.2

[dependabot[bot]]

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Bumps uglifier from 2.5.3 to 2.7.2.

Changelog

Sourced from uglifier's changelog.

2.7.2 (26 August 2015)

• update UglifyJS to 2.4.24

2.7.1 (27 February 2015)

• fix compatibility with experimental Alaska ExecJS runtime

2.7.0 (8 January 2015)

• copyright comment preservation also includes comments starting with a bang (!)

2.6.1 (1 January 2015)

• update UglifyJS to 2.4.16

2.6.0 (8 December 2014)

• allow metadata to be appended to minified code

Commits

• f15cbb8 Bump version to 2.7.2
• 7d31d54 Disable rubocop
• 9436c6c Lock rubocop to 0.28
• 4677bfe Update UglifyJS to 2.4.24
• 887648d Update UglifyJS to 2.4.23
• f6e43e8 Update UglifyJS to 2.4.17
• 614f120 Update source-map to 0.1.36
• 63ce586 Bump version to 2.7.1
• 1aa4580 Fix alaska runtime setup
• de68b2c Explicitly include Alaska in build matrix
• Additional commits viewable in compare view

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