Set release version 0.4.0 (#1047)

mpharrigan · web-flow · commit 5f56f82e4605 · 2024-06-03T16:00:01.000-07:00
diff --git a/qualtran/_version.py b/qualtran/_version.py
@@ -12,4 +12,4 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
-__version__ = "0.4.0.dev0"
+__version__ = "0.4.0"
