docs: to README.md add tests troubleshooting (run in series) #1729
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Description
This PR addresses #1723
Shows how to force tests to run in series (rather than parallel) in case of issues running tests that use bitcoind or electrsd
Notes to the reviewers
Can also enforce running in series like #1728
I figured it wouldn't hurt to add this to the README.md anyway so made a PR for both
Bugfixes: