chore: bump version (#88)

bump version

Author: yuanbohan

Cargo.toml

@@ -17,7 +17,7 @@ name = "promql-parser"
 readme = "README.md"
 description = "Parse PromQL query into AST"
 repository = "https://github.com/GreptimeTeam/promql-parser"
-version = "0.3.1"
+version = "0.4.0"
 edition = "2021"
 authors = ["The GreptimeDB Project Developers"]
 keywords = ["prometheus", "promql", "parser"]