Increment version to v0.4.0 (#48)

* version bump

* bump breathe

* pin sphinxcontrib-bibtex

* fix

.github/CHANGELOG.md

@@ -1,14 +1,12 @@
-# Release 0.3.1 (development release)
-
-<h3>New features since last release</h3>
+# Release 0.4.0
 
 <h3>Improvements</h3>
 
 * Remove support for Python 3.5.
   [(#38)](https://github.com/XanaduAI/blackbird/pull/38)
 
 * Add support for Python 3.8 and 3.9.
-  [(#39)](https://github.com/XanaduAI/blackbird/pull/39)
+  [(#40)](https://github.com/XanaduAI/blackbird/pull/39)
 
 * Add public method to retrieve Blackbird program variables via `prog.variables`.
   [(#47)](https://github.com/XanaduAI/blackbird/pull/47)
@@ -17,24 +15,23 @@
   rather than their array names (p0, p1, etc.)
   [(#47)](https://github.com/XanaduAI/blackbird/pull/47)
 
-<h3>Breaking changes</h3>
+* Remove p-type parameters from `prog.parameters` since they're only needed there internally and
+  are otherwise stored in `prog.variables`. This also changes TDM programs to not be templates
+  (`prog.is_template` now returns `False`).
+  [(#47)](https://github.com/XanaduAI/blackbird/pull/47)
 
 <h3>Bug fixes</h3>
 
+* Fix bool or string objects in for-loop iterators not working correctly.
+  [(#41)](https://github.com/XanaduAI/blackbird/pull/41)
+
 * Update the NumPy scalar types in the Blackbird listener due to being deprecated in NumPy 1.20.
   [(#43)](https://github.com/XanaduAI/blackbird/pull/43)
 
 * Add access to the symbolic expression used when creating a `RegRefTransform`,
   as a class attribute.
   [(#46)](https://github.com/XanaduAI/blackbird/pull/46)
 
-* Remove p-type parameters from `prog.parameters` since they're only needed there internally and
-  are otherwise stored in `prog.variables`. This also changes TDM programs to not be templates
-  (`prog.is_template` now returns `False`).
-  [(#47)](https://github.com/XanaduAI/blackbird/pull/47)
-
-<h3>Documentation</h3>
-
 <h3>Contributors</h3>
 
 This release contains contributions from (in alphabetical order):

blackbird_python/blackbird/_version.py

@@ -16,4 +16,4 @@
    Version number (major.minor.patch[-label])
 """
 
-__version__ = '0.3.1-dev'
+__version__ = '0.4.0'

doc/index.rst

@@ -7,7 +7,8 @@ Blackbird Quantum Assembly Language
 :Release: |release|
 :Date: |today|
 
-Blackbird is a quantum assembly language for continuous-variable quantum computation, that can be used to program Xanadu's quantum photonics hardware and Strawberry Fields simulator.
+Blackbird is a quantum assembly language for continuous-variable quantum computation, that can be
+used to program Xanadu's quantum photonics hardware and Strawberry Fields simulator.
 
 
 Features

doc/requirements.txt

@@ -1,5 +1,5 @@
 antlr4-python3-runtime>=4.7.1
 numpy
-sphinxcontrib-bibtex
-breathe==4.12.0
+sphinxcontrib-bibtex<2.0.0
+breathe~=4.29.0
 exhale