Update dependency auto-changelog to ^1.9.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
auto-changelog	devDependencies	minor	^1.8.1 -> ^1.9.0	source

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Release Notes

CookPete/auto-changelog

v1.9.0

Compare Source

8 November 2018

• Add support for azure devops and visualstudio.com #72
• Bump packages #56 #60 #61
• Add --tag-pattern option #70
• Add support for .auto-changelog config #66
• Add --release-summary option #69
• Add tests for .auto-changelog feature 17b0926
• Add tests for sortReleases 9d80b9d
• Fix quote style 5c18eda

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[codecov]

Codecov Report

Merging #30 into develop will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           develop    #30   +/-   ##
======================================
  Coverage      100%   100%           
======================================
  Files            1      1           
  Lines            1      1           
======================================
  Hits             1      1

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