Add axios and esnext stuff

[transient-jonas]

🚧 WIP | DO NOT MERGE⚠️

I'm refactoring the code to use axios instead of request and some ECMAScript new features.

[gabrielgodoy-zz]

:sleeping:

[coveralls]

Coverage decreased (-4.7%) to 57.265% when pulling f9b070ecb7d354fb32ba86dbdbdb6ae4f51680e0 on Nipher:feat/add-axios into d68f17a7c7b53dc093f0e7cd6fc074fcd99502d8 on gabrielgodoy:master.

[coveralls]

Coverage decreased (-1.7%) to 60.29% when pulling d33dfbd5c65948475790b10bcea3d04fa5d857bb on Nipher:feat/add-axios into d68f17a7c7b53dc093f0e7cd6fc074fcd99502d8 on gabrielgodoy:master.

[coveralls]

Coverage decreased (-1.7%) to 60.29% when pulling c592c96e4d64e1b458edc4c80043e1cc8c185937 on Nipher:feat/add-axios into d68f17a7c7b53dc093f0e7cd6fc074fcd99502d8 on gabrielgodoy:master.

[coveralls]

Coverage decreased (-0.4%) to 61.607% when pulling e5b0c883768966304edde249e3adecd939937c13 on Nipher:feat/add-axios into d68f17a7c7b53dc093f0e7cd6fc074fcd99502d8 on gabrielgodoy:master.

[coveralls]

Coverage increased (+5.4%) to 67.359% when pulling f69513998e69119d7699bac053ef3dff28ab476b on Nipher:feat/add-axios into d68f17a7c7b53dc093f0e7cd6fc074fcd99502d8 on gabrielgodoy:master.

[coveralls]

Coverage increased (+3.3%) to 65.282% when pulling b225b589dbec324f6997d1354b42ef268f16cc24 on Nipher:feat/add-axios into d68f17a7c7b53dc093f0e7cd6fc074fcd99502d8 on gabrielgodoy:master.

[coveralls]

Coverage increased (+3.3%) to 65.282% when pulling b225b589dbec324f6997d1354b42ef268f16cc24 on Nipher:feat/add-axios into d68f17a7c7b53dc093f0e7cd6fc074fcd99502d8 on gabrielgodoy:master.