downgrade httpx from 0.18.2 to 0.18.1

authlib currently supports http versions < 0.18.2 Recent updates involving poetry install httpx==0.18.2, this edit ensures that http==0.18.1 is installed(upgrade from pipenv's 0.11.1 install)

requested review from @jmfee

assigned to @pcain

added 4 commits

• ebdc83ab...4f19f87e - 3 commits from branch ghsc/geomag:master
• 9be7ceb0 - downgrade httpx from 0.18.2 to 0.18.1

Compare with previous version

enabled an automatic merge when the pipeline for 9be7ceb0 succeeds

mentioned in commit 0be017aa

merged