add option to search for exact same query instead of the one suggested by google

[utkarsh914]

This pull request fixes this issue #9
What it does:
if exactQuery: true is set,
it checks if the response contains No results found for ${query}
If yes, then return empty array.

with exactQuery: false

with exactQuery: true

The behavior is as expected now.

[christophebe]

This is a nice feature but we should not dependent on phrase in english. This is not working on specific country (google.fr, google.es, ....). Apparently there is not usefull selector