add release notes for 1.10.0rc2 (#6615)
add release notes for 1.10.0rc2 (#6615)


wisechengyi/pants,wisechengyi/pants,wisechengyi/pants,tdyas/pants,twitter/pants,twitter/pants,tdyas/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,twitter/pants,twitter/pants,wisechengyi/pants,twitter/pants,wisechengyi/pants,wisechengyi/pants,wisechengyi/pants,pantsbuild/pants,twitter/pants,pantsbuild/pants,tdyas/pants,twitter/pants,wisechengyi/pants,tdyas/pants,twitter/pants,benjyw/pants,benjyw/pants,tdyas/pants,benjyw/pants,jsirois/pants,benjyw/pants,jsirois/pants,benjyw/pants,pantsbuild/pants,tdyas/pants,pantsbuild/pants,wisechengyi/pants,pantsbuild/pants,tdyas/pants,tdyas/pants,twitter/pants,jsirois/pants,tdyas/pants