Fix the .editorconfig to use TAB as indent style

[rafaelhz]

The eslint config for indent style is defined as Tab, but in the .editorconfig file it was space

[coveralls]

Coverage remained the same at 94.388% when pulling 9bef987 on rafaelhz:master into 4271999 on KunalKapadia:master.

[kunalkapadia]

@rafaelhz Let's use the mostly widely approach of using 2 spaces. So instead of updating .editorconfig, can you please update.eslintrc with spaces ?

[coveralls]

Coverage remained the same at 94.388% when pulling e762714 on rafaelhz:master into 4271999 on KunalKapadia:master.

[rafaelhz]

There is no right way to indent code, but the most part of Js libs prefer 2 spaces :)