Update web3.py, eth-tester

[palango]

Next try at what #876 was doing.

There is still a test failure, but I'll report that upstream.

[palango]

Question posted here: ethereum/web3.py#1412

[codecov]

Codecov Report

Merging #1153 into master will decrease coverage by 0.13%.
The diff coverage is 85%.

@@            Coverage Diff             @@
##           master    #1153      +/-   ##
==========================================
- Coverage   81.18%   81.05%   -0.14%     
==========================================
  Files          21       21              
  Lines        1446     1446              
  Branches      188      188              
==========================================
- Hits         1174     1172       -2     
  Misses        230      230              
- Partials       42       44       +2

Impacted Files	Coverage Δ
raiden_contracts/utils/pending_transfers.py	96% <ø> (ø)	⬆️
raiden_contracts/utils/mint_tokens.py	0% <0%> (ø)	⬆️
raiden_contracts/utils/token_ops.py	0% <0%> (ø)	⬆️
raiden_contracts/deploy/contract_verifier.py	85.13% <100%> (-1.36%)	⬇️
raiden_contracts/deploy/contract_deployer.py	90% <100%> (ø)	⬆️
raiden_contracts/utils/proofs.py	92.3% <100%> (ø)	⬆️
raiden_contracts/deploy/__main__.py	93.93% <100%> (ø)	⬆️
raiden_contracts/contract_manager.py	96.42% <100%> (ø)	⬆️
raiden_contracts/utils/transaction.py	77.77% <100%> (ø)	⬆️
raiden_contracts/utils/logs.py	89.56% <100%> (ø)	⬆️
... and 1 more

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[pirapira]

Looks good to me.