chore(deps): update dependency excoveralls to == 0.18.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
excoveralls	minor	~> 0.14 and >= 0.14.4 -> == 0.18.1

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[coveralls]

coverage: 80.597% (-6.7%) from 87.302% when pulling b3b677ba8e4ff2ad6e8188e0a45b718522e51335 on renovate/excoveralls-0.x into 110fa92461fdde6d49f6081a658db71f58858914 on master.

[coveralls]

Coverage increased (+1.9%) to 82.54% when pulling 566c15ba5107f07cde7c71455443d659631c2922 on renovate/excoveralls-0.x into 982931dda5bcba0f9ea5f359580911ef6007b748 on master.