A summary of what is in this release since 1.4.0:

• GRPC support for Go.
• C# accessors now based on structs (generates less garbage).
• Improved object API (e.g. choice of pointer types, external references).
• Flatc can test for conformity against older schema.
• In-place binary search lookups for C# and Java.
• Documentation improvements.
• Many other fixes and improvements, 133 commits since 1.4.0