chore(master): release 2.1.0

[release-please]

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

2.1.0 (2021-02-24)

Features

• Add ErrorReason enum from google.api.error_reason for Google API and minor proto updates. (528a2ae)
• add Interval, Month, PhoneNumber type protos (#80) (696083b)
• Add the UNORDERED_LIST enum value for google.api.field_behavior. (#95) (51d6ae0)
• Enhance the AttributeContext semantics, and other comments update (#113) (528a2ae)

Documentation

• changes "may" to preferred "might" (efb1726)
• regenerate javadocs from protos (#69) (1759fe7)
• update generated logging type javadoc (#87) (9f122e8)
• Update inclusive language in the documentation. Also other latest doc updates. (#78) (fda2e7b)
• Updates "unit" description: changes "KBy" to "kBy" (#99) (efb1726)
• updates an "http" link to "https" (efb1726)

Dependencies

• update dependency com.google.guava:guava to v30.1-android (#96) (ad6beb6)
• update dependency com.google.protobuf:protobuf-bom to v3.14.0 (#86) (ad85e3a)
• update dependency com.google.protobuf:protobuf-bom to v3.15.0 (#116) (8e48b28)
• update dependency com.google.protobuf:protobuf-bom to v3.15.2 (#118) (5e7415a)
• update dependency io.grpc:grpc-bom to v1.35.0 (#93) (6243d5b)
• update dependency io.grpc:grpc-bom to v1.36.0 (#119) (9eb9d03)

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🤖 Release is at https://github.com/googleapis/java-common-protos/releases/tag/v2.1.0 🌻

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