Karma coverage seems to include tests under Windows

[mightyiam]

snabbdom/karma.conf.js

Line 46 in aac0233

exclude: /test\//,

According to documentation, it seems that this would result in test files to be included in coverage under Windows:
https://github.com/monounity/karma-typescript/tree/master/packages/karma-typescript#advanced-configuration

beware that Windows uses \ while UNIX-like systems use / as path separator.