Add Masayuki Hatta and Kuno Woudt to THANKS.
Revise README.md in various ways.
Reverse order of child-of-fair-use clause and no-trademark-license clause.
Some rewording of 'nullification' provision.

One change here is to refer simply to 'Covered Work' rather than
something that 'would have been a Covered Work had you prepared it'. I
believe the latter language may have been tied to earlier versions of
Covered Work definition.
Add 'powered by' clauses to anti-badgeware clause in section 3.
Minor word order change in pass-through section.
Economize 'no remote downstream termination' clause in termination section.
Simplify object code distribution section.

With this simplified presentation, network access is the normal way to
comply with the source code requirement, but the distributor of a
'Product' can alternatively comply by accompanying it with the source
code.
Add inbound=outbound-style contribution condition.

This is inspired by Apache License 2.0 section 5. The term
'symmetrical licensing' in this context was, to my knowledge, coined
by Mike Milinkovic of the Eclipse Foundation.
Minor improvement to inbound=outbound condition.
Move inbound=outbound condition earlier in license text.