message: Update README.md integer data type section
  Update README.md
  Add `INT8`, `INT16`, `INT32`, `INT128` and `UINT8` data type info
diff: @@ -148,7 +148,7 @@ GlueSQL currently supports a limited subset of queries. It's being actively deve
  #### Data Types
  | Category | Type |
  |----------|---------------------------------------------------------------------------|
  -| Numeric | `INT(8)`, `INT(16)`, `INT(32)`, `INTEGER`, `INT(128)`, `FLOAT`, `DECIMAL` |
  +| Numeric | `INT8`, `INT16`, `INT32`, `INTEGER`, `INT128`, `UINT8`, `FLOAT`, `DECIMAL`|
  | Date | `DATE`, `TIME`, `TIMESTAMP`, `INTERVAL` |
  | Others | `BOOLEAN`, `TEXT`, `UUID`, `MAP`, `LIST`, `BYTEA` |
  