chore(ci): reduce config spread

[TobiTenno]

combine configs
move ci to github actions (faster, more reliable, less limited)

@filipedeschamps if this all works, I'll need you to add an npm token to the repository secrets as NPM_TOKEN, as well as to change the expected checks from coveralls and travis over to the new ones from the github actions

[TobiTenno]

@filipedeschamps could you remove travis and add the lint and test actions as required instead?

[TobiTenno]

and we need a token added to the repo as NPM_TOKEN for publishing automatically with gh actions?

[filipedeschamps]

1. Removed all required checks.
2. Added NPM_TOKEN secret.
3. I will now close and reopen the PR.

[filipedeschamps]

Added the remaining checks:

[TobiTenno]

thanks! I'll get this one fixed up and merged whenever i get the chance