Bump web3 from 5.11.0 to 5.20.0 in /requirements

[dependabot]

Bumps web3 from 5.11.0 to 5.20.0.

Changelog

Sourced from web3's changelog.

v5.20.0 (2021-06-09)

Web3 5.20.0 (2021-06-09)

Features

- Add new AsyncHTTPProvider. No middleware or session caching support yet.
Also adds async w3.eth.gas_price, and async w3.isConnected() methods. ([#1978](https://github.com/ethereum/web3.py/issues/1978) <https://github.com/ethereum/web3.py/issues/1978>__)


Add ability for AsyncHTTPProvider to accept middleware
Also adds async gas_price_strategy middleware, and moves gas estimate to middleware.
AsyncEthereumTesterProvider now inherits from AsyncBase ([#1999](https://github.com/ethereum/web3.py/issues/1999) <https://github.com/ethereum/web3.py/issues/1999>__)


Support state_override in contract function call. ([#2005](https://github.com/ethereum/web3.py/issues/2005) <https://github.com/ethereum/web3.py/issues/2005>__)


Bugfixes

• Test ethpm caching + bump Sphinx version. ([#1977](https://github.com/ethereum/web3.py/issues/1977) <https://github.com/ethereum/web3.py/issues/1977>__)

Improved Documentation

- Clarify solidityKeccak documentation. (`[#1971](https://github.com/ethereum/web3.py/issues/1971) <https://github.com/ethereum/web3.py/issues/1971>`__)
- Improve contributor documentation context and ordering. (`[#2008](https://github.com/ethereum/web3.py/issues/2008) <https://github.com/ethereum/web3.py/issues/2008>`__)
- Add docs for unstable AsyncHTTPProvider (`[#2017](https://github.com/ethereum/web3.py/issues/2017) <https://github.com/ethereum/web3.py/issues/2017>`__)
Misc

- `[#1979](https://github.com/ethereum/web3.py/issues/1979) &lt;https://github.com/ethereum/web3.py/issues/1979&gt;`__, `[#1980](https://github.com/ethereum/web3.py/issues/1980) &lt;https://github.com/ethereum/web3.py/issues/1980&gt;`__, `[#1993](https://github.com/ethereum/web3.py/issues/1993) &lt;https://github.com/ethereum/web3.py/issues/1993&gt;`__, `[#2002](https://github.com/ethereum/web3.py/issues/2002) &lt;https://github.com/ethereum/web3.py/issues/2002&gt;`__
v5.19.0 (2021-04-28)
Web3 5.19.0 (2021-04-28)
Features



Handle optional eth_call state override param. ([#1921](https://github.com/ethereum/web3.py/issues/1921) &lt;https://github.com/ethereum/web3.py/issues/1921&gt;__)
Add list_storage_keys deprecate listStorageKeys ([#1944](https://github.com/ethereum/web3.py/issues/1944) &lt;https://github.com/ethereum/web3.py/issues/1944&gt;__)
Add net_peers deprecate netPeers ([#1946](https://github.com/ethereum/web3.py/issues/1946) &lt;https://github.com/ethereum/web3.py/issues/1946&gt;__)
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Commits

• 10e55fa Bump version: 5.19.0 → 5.20.0
• b91947e Compile release notes
• 3c6567e Add newsfragment for AsyncHTTPProvider docs
• aabebf6 AsyncHTTPProvider docs
• 46953d1 Add unstable warning for async providers
• d4b2815 Move async_eth to eth
• b596263 Benchmark send_transaction and get_block
• 17264b4 Add async and sync buffered gas estimate middleware
• 8265f13 gas price middleware working
• f160914 Add async gas price strategy middleware
• Additional commits viewable in compare view

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Superseded by #43.