Update h2 from 2.5.2 to 2.6.0 (#1789)
Update h2 from 2.5.2 to 2.6.0 (#1789)


pypa/warehouse,alex/warehouse,dstufft/warehouse,dstufft/warehouse,alex/warehouse,dstufft/warehouse,pypa/warehouse,alex/warehouse,dstufft/warehouse,alex/warehouse,pypa/warehouse,alex/warehouse,pypa/warehouse