Bump github.com/golang/protobuf from 1.5.2 to 1.5.3

[dependabot[bot]]

Bumps github.com/golang/protobuf from 1.5.2 to 1.5.3.

Release notes

Sourced from github.com/golang/protobuf's releases.

v1.5.3

Notable changes

*( #1363) jsonpb: accept 'null' as a valid representation of NullValue in unmarshal

Commits

• 5d5e8c0 Merge pull request #1363 from neild/jsonnull
• 37828f9 jsonpb: accept 'null' as a valid representation of NullValue in unmarshal
• See full diff in compare view

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[coveralls]

Coverage: 44.489% (+0.5%) from 43.952% when pulling bc55ebfb986067e57f9ea098eac5663981a0d93e on dependabot/go_modules/github.com/golang/protobuf-1.5.3 into 3c11e39a2f8f64c3aff94b600c954ebaaa9c1c74 on master.

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