Update changelog with dagger 2 information, and reformat.
Update changelog with dagger 2 information, and reformat.

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Automatic change by MOE
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=107358545

ravn/dagger,ronshapiro/dagger,ze-pequeno/dagger,hansonchar/dagger,AttwellBrian/dagger,google/dagger,ravn/dagger,AttwellBrian/dagger,ronshapiro/dagger,hansonchar/dagger,ze-pequeno/dagger,hansonchar/dagger,ze-pequeno/dagger,ze-pequeno/dagger,ronshapiro/dagger,google/dagger,dushmis/dagger,google/dagger,google/dagger,cgruber/dagger,ravn/dagger,dushmis/dagger,cgruber/dagger,cgruber/dagger