build: bump semantic-release from 15.1.11 to 15.3.1

[dependabot-preview]

Bumps semantic-release from 15.1.11 to 15.3.1.

Release notes

Sourced from semantic-release's releases.

v15.3.1

15.3.1 (2018-05-05)

Bug Fixes

• package: update cosmiconfig to version 5.0.0 (349b2e8)

v15.3.0

15.3.0 (2018-05-04)

Features

• log git error message when authentication verification fails (cd9f2bd)

v15.2.0

15.2.0 (2018-05-01)

Features

• add support for Bitbucket token in environment variables (c93775c)

Commits

• 349b2e8 fix(package): update cosmiconfig to version 5.0.0
• 1ed466e ci: run test on Node.js 10
• f0f325d docs: add link to shareable configs and plugins list
• f3e4991 chore(package): update xo to version 0.21.0
• cd9f2bd feat: log git error message when authentication verification fails
• d1c3ad0 docs: issue templates order
• e3da172 docs: remove old issue templates
• 05b09b1 docs(ISSUE_TEMPLATES): initial version
• c93775c feat: add support for Bitbucket token in environment variables
• 22c5bbe chore(package): update fs-extra to version 6.0.0
• See full diff in compare view

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[coveralls]

Coverage remained the same at 94.904% when pulling 50b42dc on dependabot/npm_and_yarn/semantic-release-15.3.1 into 1bb2e53 on master.

[dependabot-preview]

Superseded by #54.