Adjusted release scripts to a new version of ckeditor5-dev-env

[pomek]

Suggested merge commit message (convention)

Internal: Adjusted release scripts to a new version of @ckeditor/ckeditor5-dev-env.

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Additional information

Requires: ckeditor/ckeditor5-dev#497

[Reinmar]

Is this up to date with ckeditor5-dev? Because this happened:

(t/ckeditor5-dev/496 af7dae2) p@m /workspace/misc/mgit2> npm run release:bump-version

> mgit2@0.10.1 release:bump-version /workspace/misc/mgit2
> node ./scripts/bump-version.js

path.js:39
    throw new ERR_INVALID_ARG_TYPE('path', 'string', path);
    ^

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received type object
    at assertPath (path.js:39:11)
    at Object.join (path.js:1155:7)
    at getSubRepositoriesPaths (/workspace/misc/mgit2/node_modules/@ckeditor/ckeditor5-dev-env/lib/release-tools/utils/getsubrepositoriespaths.js:31:28)
    at bumpVersions (/workspace/misc/mgit2/node_modules/@ckeditor/ckeditor5-dev-env/lib/release-tools/tasks/bumpversions.js:46:26)
    at Object.bumpVersions (/workspace/misc/mgit2/node_modules/@ckeditor/ckeditor5-dev-env/lib/index.js:18:57)
    at Object.<anonymous> (/workspace/misc/mgit2/scripts/bump-version.js:11:3)
    at Module._compile (internal/modules/cjs/loader.js:688:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
    at Module.load (internal/modules/cjs/loader.js:598:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! mgit2@0.10.1 release:bump-version: `node ./scripts/bump-version.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the mgit2@0.10.1 release:bump-version script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/p/.npm/_logs/2019-07-15T13_37_50_763Z-debug.log

But I wasn't executing this on master, so I dunno if that's not causing this error.

[coveralls]

Pull Request Test Coverage Report for Build 332

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 99.251%

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Totals
Change from base Build 326:	0.0%
Covered Lines:	504
Relevant Lines:	504

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💛 - Coveralls

[Reinmar]

Oh, this PR is blocked by ckeditor/ckeditor5-dev#497. Sorry, didn't notice that.