Cleanup travis config file (#3776)
Cleanup travis config file (#3776)

Our travis config file was using some deprecated syntax which is no
longer supported on travis. This commit goes through and cleans things
up to make sure the config is compliant with travis's syntax and enable
running jobs again.
QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py,QISKit/qiskit-sdk-py