fix: allow wss connections

[matnad]

What I did

Fix to allow wss connections.
Tested by connecting to infura using wss endpoint.

Related issue: #541

How I did it

see PR

How to verify it

Replace host for the mainnet network in the network-config.yaml file with host: wss://mainnet.infura.io/ws/v3/$WEB3_INFURA_PROJECT_ID

Checklist

• I have confirmed that my PR passes all linting checks
• I have included test cases
• I have updated the documentation
• I have added an entry to the changelog

[codecov-commenter]

Codecov Report

Merging #542 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #542   +/-   ##
=======================================
  Coverage   88.40%   88.40%           
=======================================
  Files          56       56           
  Lines        6259     6259           
  Branches     1381     1381           
=======================================
  Hits         5533     5533           
  Misses        496      496           
  Partials      230      230           

Impacted Files	Coverage Δ
brownie/network/web3.py	97.19% <100.00%> (ø)

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