Pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
babel-core	devDependencies	pin	^6.26.3 -> 6.26.3	homepage, source
babel-preset-es2015	devDependencies	pin	^6.24.1 -> 6.24.1	homepage, source
gulp	devDependencies	pin	^4.0.0 -> 4.0.0	homepage, source
gulp-babel	devDependencies	pin	^7.0.0 -> 7.0.0	source
gulp-cli	devDependencies	pin	^2.0.1 -> 2.0.1	homepage, source
gulp-plumber	devDependencies	pin	^1.1.0 -> 1.1.0	source

:pushpin: 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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