v7.2.0 proposal

Checklist

• make -j8 test (UNIX), or vcbuild test nosign (Windows) passes
• commit message follows commit guidelines

Description of change

Planned for later today. (Shortly)

Notable changes (unformatted)

• [c4f33b48f7] - (SEMVER-MINOR) src: extend HeapStatistics with new fields (Gareth Ellis) #8610
• [163397a206] - (SEMVER-MINOR) process: add process.memoryUsage.external (Fedor Indutny) #9587
• [0a3e5cc57a] - (SEMVER-MINOR) dns: implement {ttl: true} for dns.resolve6() (Ben Noordhuis) #9296
• [1bd79368cd] - (SEMVER-MINOR) dns: implement {ttl: true} for dns.resolve4() (Ben Noordhuis) #9296
• [08a7e7b009] - (SEMVER-MINOR) crypto: return this in setAuthTag/setAAD (Kirill Fomichev) #9398
• [786631c7b4] - deps: upgrade libuv to 1.10.1 (cjihrig) #9647
• [1520afd336] - deps: update V8 to 5.4.500.43 (Michaël Zasso) #9697

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CI: https://ci.nodejs.org/job/node-test-pull-request/4945/