Updated browserstack library
Updated browserstack library

Includes a bug fix for network errors.

Previously, if a browerstack request errored then it would exit the process and leave the browserstack tunnel wide open.
shirish87/karma-browserstack-launcher,mzgol/karma-browserstack-launcher,karma-runner/karma-browserstack-launcher,szarouski/karma-browserstack-launcher,luhmann/karma-browserstack-launcher,Dignifiedquire/karma-browserstack-launcher,jackspirou/karma-browserstack-launcher