Add `httpx` recipe #2040

Job	Run time
documentation	14s
Flake8 tests	21s
Build test APP [ ${{ matrix.runs_on }} \| ${{ matrix.bootstrap.name }} ]	0s
Build test APP [ ${{ matrix.runs_on }} \| ${{ matrix.bootstrap.name }} ]	0s
Test updated recipes for arch ${{ matrix.android_arch }} [ ${{ matrix.runs_on }} ]	0s
Test updated recipes for arch ${{ matrix.android_arch }} [ ubuntu-latest ]	0s
Pytest [Python ${{ matrix.python-version }} \| ${{ matrix.os }}]	0s
coveralls_finish	0s
	35s

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