Upgrade dependency versions

[banjoh]

Is there a reason not to upgrade to these versions?

Flask >= 1.0
Boto3 >= 1.9

I ran the tests and the pass. I'd be happy to help if need be

[secbug]

It also seems the dependency of pip._internals in setup.py is different now too, as importing this library is now broken on updated python/pip versions.

File "C:\Users\-InsertUser-\AppData\Local\Temp\pip-install-s3u6otvw\flask-boto3\setup.py", line 10, in <listcomp>
        reqs = [str(ir.req) for ir in install_reqs]
    AttributeError: 'ParsedRequirement' object has no attribute 'req' 

This is coming from:
try: # for pip >= 10 from pip._internal.req import parse_requirements