Prepare 0.4.0 release

PiperOrigin-RevId: 613281438

Author: l46kok

README.md

@@ -55,14 +55,14 @@ CEL-Java is available in Maven Central Repository. [Download the JARs here][8] o
 <dependency>
   <groupId>dev.cel</groupId>
   <artifactId>cel</artifactId>
-  <version>0.3.1</version>
+  <version>0.4.0</version>
 </dependency>
 ```
 
 **Gradle**
 
 ```gradle
-implementation 'dev.cel:cel:0.3.0'
+implementation 'dev.cel:cel:0.4.0'
 ```
 
 Then run this example:

publish/BUILD.bazel

@@ -16,6 +16,7 @@ RUNTIME_TARGETS = [
 COMPILER_TARGETS = [
     "//parser/src/main/java/dev/cel/parser",
     "//parser/src/main/java/dev/cel/parser:parser_builder",
+    "//parser/src/main/java/dev/cel/parser:unparser",
     "//checker/src/main/java/dev/cel/checker:checker",
     "//checker/src/main/java/dev/cel/checker:checker_builder",
     "//checker/src/main/java/dev/cel/checker:proto_type_mask",

publish/cel_version.bzl

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 """Maven artifact version for CEL."""
-CEL_VERSION = "0.3.1"
+CEL_VERSION = "0.4.0"