fix: set tunnel to true
fix: set tunnel to true

This is kind of weird setting, see https://github.com/browserstack/api/issues/9

I think setting it always to true is the best we can do now, as running BS with Karma without a tunnel does not make any sense.
Dignifiedquire/karma-browserstack-launcher,jackspirou/karma-browserstack-launcher,karma-runner/karma-browserstack-launcher,mzgol/karma-browserstack-launcher,szarouski/karma-browserstack-launcher,luhmann/karma-browserstack-launcher,shirish87/karma-browserstack-launcher