Upgrade karma, for compatibility with latest webpack
Upgrade karma, for compatibility with latest webpack

strllar/js-stellar-base,johansten/js-stellar-base,stellar/js-stellar-base,johansten/js-stellar-base,stellar/js-stellar-base,strllar/js-stellar-base,manran/js-stellar-base,manran/js-stellar-base,johansten/js-stellar-base,manran/js-stellar-base,strllar/js-stellar-base