httpie dependency not pinned

[vbhavsar]

httpie dependency is defined as

httpie-aws-auth/setup.py

Line 26 in bc2435c

'httpie>=0.9.7',

httpie is now at 2.6.0 and many things have changed since 0.9.7. This causes issues such as #3.

There is another compatibility issue. This import also doesn't exist in 2.6.0

httpie-aws-auth/httpie_aws_auth.py

Line 10 in bc2435c

from httpie.compat import bytes

I believe the right way to fix this is to pin the dependency to a specific version (or a range of known good versions).

[m9aertner]

I ran into that second issue as well

from httpie.compat import bytes

I think that line can just be removed.