Update README.md

We increase the library version to 0.9.9
Merge branch 'develop'
Solved the problem with the new method about download files
Removed the fault unit test
Added new lines to the travis file
Included a testFolder where the unit tests are executed and to avoid that some of them fail
Removed the credentials
Included a recommendation for the unit test folder
Included the last conflict unit test
Delete a blank space
Checking travis failure
Checking travis failure
Checking travis failure
Checking travis failure
Checking travis failure
Checking travis failure
Checking travis failure
Checking travis failure
Checking travis failure
Fixed travis failure