0.4.8

Reduce memory usage at compile time

• go-json have used about 2GB of memory at compile time, but now it can compile with about less than 550MB.

Fix any encoder's bug

• Add many test cases for encoder
• Fix composite type ( slice/array/map )
• Fix pointer types
• Fix encoding of MarshalJSON or MarshalText or json.Number type

Refactor encoder

• Change package layout for reducing memory usage at compile
• Remove anonymous and only operation
• Remove root property from encodeCompileContext and opcode

Fix CI

• Add Go 1.16
• Remove Go 1.13
• Fix make cover task

Number/Delim/Token/RawMessage use the types defined in encoding/json by type alias