chore: release 7.0.0

[github-actions]

🤖 I have created a release *beep* *boop*

7.0.0 (2021-06-30)

⚠ BREAKING CHANGES

• move command line tool to a new package named protobufjs-cli (feat!: move command line tool to a new package named protobufjs-cli protobufjs/protobuf.js#1234)
• encoding of empty Buffers (fix!: encoding of empty Buffers protobufjs/protobuf.js#1514)

Features

• add --no-service option for pbjs static target (#1577) (d01394a)
• add getTypeUrl method to generated code (#1463) (d13d5d5)
• add null-defaults option (#1611) (6e713ba)
• move command line tool to a new package named protobufjs-cli (#1234) (da34f43)
• proto3 optional support (#1584) (6c4d307)

Bug Fixes

• allow for an optional semicolon where there is an optional comma in parseOptionValue (#1571) (af1b449)
• encoding of empty Buffers (#1514) (b4cae07), closes #1500 #885
• fromObject should not initialize oneof members (#1597) (90afe44)
• handling properly fields with leading and trailing comments after field with trailing comment (#1593) (9011aac)
• support for options with repeated_value: [ "foo", "bar" ] (#1574) (f5b893c)
• typo in pbjs help text (#1552) (7f46dbe)

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