Removed cytoolz hard dependency and CI fixes

[6ug]

What was wrong?

Fixed #70 with 5cd74f8

• Remove cytoolz from the direct dependencies.
• Update the eth-utils requirement to be >=1.3.0,<2
• Update all imports that come from cytoolz to instead come from eth_utils.toolz

Fixes #69 with a236489

• Add the eth-typing>=2.0.0,<3 library as a dependency.
• Add a new command to the flake8 environment in the tox.ini file that runs
• Update the setup.py to expose data to other libraries
• Add all missing type hints.

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[pipermerriam]

@6ug I believe you can remove the .travis.yml file as it is no longer needed.

[pipermerriam]

@6ug looks like you can lower the eth-utils to >=1.2.2. 1.3.0 is still in beta.

[pipermerriam]

some sort of dependency failure that I'll dig into on Monday if it isn't resolved by then.

I'm also good with dropping support for rlp<1 and requiring the newer version of the library.

[carver]

At least one issue is that mypy was never added as a dependency in setup.py

[6ug]

I'm also good with dropping support for rlp<1 and requiring the newer version of the library.

@pipermerriam are you talking about dropping rlp<1 and using newer versions for rlp<1 ? or second sentence was about libraries in general?

do you know exact supportive versions? I tried with rlp0: rlp>=1.0.3,<2 and rlp1: rlp>=1,<2, it did not worked for me.

[pipermerriam]

@6ug

We currently support two major version ranges of pyrlp. The 0.x line and the 1.x line. I'm proposing that we drop support for rlp<1 which would allow removal of the rlp0/rlp1 deliniation in the tox.ini and ci runs, and only test against rlp>=1,<2.