Add `docs` action #35

Job	Run time
Lint pull request (18.x)	1m 21s
Build and test pull request (14.x, cjs, es5)	2m 25s
Build and test pull request (14.x, cjs, es2015)	2m 24s
Build and test pull request (14.x, esm, es5)	2m 30s
Build and test pull request (14.x, esm, es2015)	2m 32s
Build and test pull request (14.x, umd, es5)	2m 14s
Build and test pull request (14.x, umd, es2015)	2m 12s
Build and test pull request (16.x, cjs, es5)	2m 36s
Build and test pull request (16.x, cjs, es2015)	2m 24s
Build and test pull request (16.x, cjs, esnext)	2m 23s
Build and test pull request (16.x, esm, es5)	2m 31s
Build and test pull request (16.x, esm, es2015)	2m 31s
Build and test pull request (16.x, esm, esnext)	2m 29s
Build and test pull request (16.x, umd, es5)	2m 17s
Build and test pull request (16.x, umd, es2015)	2m 9s
Build and test pull request (16.x, umd, esnext)	2m 4s
Build and test pull request (18.x, cjs, es5)	2m 31s
Build and test pull request (18.x, cjs, es2015)	2m 26s
Build and test pull request (18.x, cjs, esnext)	2m 33s
Build and test pull request (18.x, esm, es5)	2m 28s
Build and test pull request (18.x, esm, es2015)	2m 34s
Build and test pull request (18.x, esm, esnext)	2m 28s
Build and test pull request (18.x, umd, es5)	2m 16s
Build and test pull request (18.x, umd, es2015)	2m 15s
Build and test pull request (18.x, umd, esnext)	2m 7s
	58m 40s

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