• Add support for request compression on clients and request decompression on servers (#1952 contributed by @b0b3rt)
• Improve messaging for some RESOURCE_EXHAUSTED errors (#1946)
• Export TypeScript types for ServiceClientConstructor and ProtobufTypeDefinition (#1951 contributed by @howyi)
• Provide the full certificate object in the checkServerIdentity callback (#1968)
• Remove @types/semver from the production dependencies list (#1989)
• Add information about supported channel options to the README (#1996 contributed by @josephharrington)