second attempt releasing (#515)

Author: yihozhang

CHANGELOG.md

@@ -129,6 +129,7 @@ As of yet, the rust interface is not documented or well supported. We reccomend
 [0.1.0]: https://github.com/egraphs-good/egglog/tree/v0.1.0
 [0.2.0]: https://github.com/egraphs-good/egglog/tree/v0.2.0
 [0.3.0]: https://github.com/egraphs-good/egglog/tree/v0.3.0
+[0.4.0]: https://github.com/egraphs-good/egglog/tree/v0.4.0
 
 
 See release-instructions.md for more information on how to do a release.

Cargo.lock

@@ -1,7 +1,7 @@
 [package]
 edition = "2021"
 name = "egglog"
-version = "0.3.0"
+version = "0.4.0"
 description = "egglog is a language that combines the benefits of equality saturation and datalog. It can be used for analysis, optimization, and synthesis of programs. It is the successor to the popular rust library egg."
 repository = "https://github.com/egraphs-good/egglog"
 keywords = ["e-graphs", "egglog", "datalog", "compiler", "equality"]

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 edition = "2021"
 name = "web-demo"
-version = "0.3.0"
+version = "0.4.0"
 
 [lib]
 crate-type = ["cdylib"]