After following all the steps written in github for implementing geo-coding, I got the output for google maps. Repeating the same steps for the bing maps I got the output (latitude and longitude) using correct API key.
Issue is:
1: The value got from both the maps are not exactly same after decimal.
2: Bing map is not reliable (When I tried using bing map again after some period of time I didn't get the output).

This is what I got when I fired get command second time ,

object(Geocoder\Result\Geocoded)[846]
protected 'latitude' => int 0
protected 'longitude' => int 0
protected 'bounds' => null
protected 'streetNumber' => null
protected 'streetName' => null
protected 'cityDistrict' => null
protected 'city' => null
protected 'zipcode' => null
protected 'county' => null
protected 'countyCode' => null
protected 'region' => null
protected 'regionCode' => null
protected 'country' => null
protected 'countryCode' => null
protected 'timezone' => null

Please reply soon if anyone knows about this issue.