Add "build" to .gitignore. #14

Job	Run time
Python 2.7 (py27)	2s
Python 3.7 (py37)	11s
Python 3.8 (py38)	7s
Python 3.9 (py39)	10s
Python 3.10 (py310)	8s
Python 2.7 (py27-ansible19,py27-ansible24,py27-ansible25,py27-ansible26,py27-ansible27,py27-ansible28,py27-ansible29,py27-ansible210)	2s
Python 3.7 (py37-ansible25,py37-ansible26,py37-ansible27,py37-ansible28,py37-ansible29,py37-ansible210)	12s
Python 3.8 (py38-ansible25,py38-ansible26,py38-ansible27,py38-ansible28,py38-ansible29,py38-ansible210)	12s
Python 3.9 (py39-ansible25,py39-ansible26,py39-ansible27,py39-ansible28,py39-ansible29,py39-ansible210)	9s
Python 3.10 (py310-ansiblecore211,py310-ansiblecore212,py310-ansiblecore213)	6s
	1m 19s

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