build(deps): bump @semantic-release/github from 5.2.10 to 5.4.0

[dependabot-preview]

Bumps @semantic-release/github from 5.2.10 to 5.4.0.

Release notes

Sourced from [@​semantic-release/github's releases](https://github.com/semantic-release/github/releases).

v5.4.0

5.4.0 (2019-06-07)

Features

• GitHub Actions support (30d5175)

v5.3.5

5.3.5 (2019-06-06)

Bug Fixes

• package: update issue-parser to version 4.0.0 (543e7d6)

v5.3.4

5.3.4 (2019-06-04)

Bug Fixes

• dependency updates (b6f32e6)

v5.3.3

5.3.3 (2019-05-12)

Bug Fixes

• package: update fs-extra to version 8.0.0 (acda05b)

v5.3.2

5.3.2 (2019-04-25)

Bug Fixes

• adapt for latest @octokit/rest to remove deprecation warnings (#177) (fa677fa)

v5.3.1

5.3.1 (2019-04-01)

Bug Fixes

• package: update aggregate-error to version 3.0.0 (2b5c09b)

v5.3.0

5.3.0 (2019-03-25)

... (truncated)

Commits

• 30d5175 feat: GitHub Actions support
• 543e7d6 fix(package): update issue-parser to version 4.0.0
• a7eac93 style: preserve alphabetical order of properties in package.json
• b6f32e6 fix: dependency updates
• 1a4a1ad chore(package): update ava to version 2.0.0
• 12527bd chore(message): fix typo for missing issue message
• acda05b fix(package): update fs-extra to version 8.0.0
• 6f92175 style: exempt "issue_number" and "pull_number" from camelcase rule
• fa677fa fix: adapt for latest @octokit/rest to remove deprecation warnings (#177)
• d2d873c chore(package): update tempy to version 0.3.0
• Additional commits viewable in compare view

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