Version Bump (#202)

* post release version bump

* Trigger CI

---------

Co-authored-by: mudit2812 <[email protected]>
Co-authored-by: Mudit Pandey <[email protected]>

Author: github-actions[bot]

CHANGELOG.md

@@ -1,3 +1,22 @@
+# Release 0.40.0-dev
+
+### New features since last release
+
+### Improvements 🛠
+
+### Breaking changes 💔
+
+### Deprecations 👋
+
+### Documentation 📝
+
+### Bug fixes 🐛
+
+### Contributors ✍️
+
+This release contains contributions from (in alphabetical order):
+
+---
 # Release 0.39.0
 
 ### Bug fixes 🐛

pennylane_cirq/_version.py

@@ -16,4 +16,4 @@
    Version number (major.minor.patch[-label])
 """
 
-__version__ = "0.39.0"
+__version__ = "0.40.0-dev"