v0.2019.06.14.1328

• Update to use overhauled ipfsapi module, now named ipfshttpclient (#608)
• Made final adjustments to migrating to Python 3 (#51)
• Using newer version of Python now mitigates issues with mementos prior to year 1900 (#603)
• Updates tests to use latest version of go-ipfs (v. 0.4.21)