ignoring IntelliJ IDEA files
Refactoring: code formatted and imports optimised
Update README.md
Formatting, optimising imports and renamed test methods to make them follow the same naming convention
refactoring: removed duplication on the validation part of method buildFinalURLWithTheAPIKey
Merge pull request #72 from carlosvillademor/refactoring

Refactoring - Reformatting and optimising imports - Partially solving #53
Merge Carlos's changes from branch carlosvillademor-refactoring-buildFinalURLWithTheAPIKey