chore: bump version to 0.7.0 (#118)

Signed-off-by: Ruihang Xia <waynestxia@gmail.com>

Author: waynexia

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 = "0.6.0"
+version = "0.7.0"
 edition = "2021"
 authors = ["The GreptimeDB Project Developers"]
 keywords = ["prometheus", "promql", "parser"]