⬆️ Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
@​octokit/rest	dependencies	pin	^15.1.7 -> 15.15.1	source
ava	devDependencies	pin	^0.25.0 -> 0.25.0	homepage, source
babel-plugin-istanbul	devDependencies	pin	^4.1.3 -> 4.1.6	source
babel-preset-env	devDependencies	pin	^1.6.0 -> 1.7.0	homepage, source
eslint	devDependencies	pin	^4.7.0 -> 4.19.1	homepage, source
eslint-plugin-ava	devDependencies	pin	^4.5.1 -> 4.5.1	source
nyc	devDependencies	pin	^11.0.1 -> 11.9.0	source
semver	dependencies	pin	^5.3.0 -> 5.6.0	source
util.promisify	dependencies	pin	^1.0.0 -> 1.0.0	source

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges your config if you instead don't wish to pin dependencies.

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