v1.5.0

Highlights:

• Added support for custom gRPC headers that can be used to pass auth tokens.
• [opt-in] Users can now specify keep alive configuration for gRPC connections to the server in order to detect dead connections if server closes them abruptly.
• Couple bug fixes.

Changes: 2021-02-10 - a97e3b2 - Panic when Invalid Struct is Registered (#361) 2021-02-15 - 000fce6 - Update workflow package registration notes (#355) 2021-02-17 - cba4548 - Fixes a possible panic when server resp is missing workflow type (#364) 2021-02-19 - 80e324b - Use raw JSON to convert payload to string (#366) 2021-02-22 - 8e45a8d - Set Local Activity result to empty not nil (#367) 2021-02-23 - 2245a30 - Adding support for custom gRPC headers (#368) 2021-02-24 - 50a785d - Use go 1.16 (#369) 2021-02-25 - eccb99a - Add keep alive to gRPC connection (#370) 2021-02-26 - 555111c - Make keep alive configurable and opt-in (#371)