chore(deps): update dependency auto-changelog to v1.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
auto-changelog	devDependencies	minor	1.12.0 -> 1.15.0

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Release Notes

CookPete/auto-changelog

v1.15.0

Compare Source

13 August 2019

• Add --config option #127
• Infer semver versions from numeric tags #126

v1.14.1

Compare Source

13 August 2019

• Add --config option #127
• Infer semver versions from numeric tags #126

v1.14.0

Compare Source

8 July 2019

• Add regenerator-runtime dependency #125

v1.13.0

Compare Source

7 July 2019

• Update babel/rimraf/nyc #122
• HTTPS links to external sites #120
• Add support for alternate date sorting #113
• fix for handlebars-setup arg #110
• Add --append-git-log option #118 #117
• Update test data bb3a347
• Add commit object to merge data 2a8de35
• Fix commander argument syntax 01739fe

v1.12.1

Compare Source

16 April 2019

• Support partial semver tag sorting #94
• Update --package option to accept file path #106
• Tidy up getOptions 0168216
• Tidy up readJson util 36bfd9e
• Space out error logs 2bc35ce

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