v0.3.3 release branch (#359)

* bump version number

* Update README.md

Author: waltsims

docs/README.md

@@ -33,7 +33,7 @@ After installation, run the B-mode reconstruction example in the `examples` dire
 ```bash
 git clone https://github.com/waltsims/k-wave-python
 cd k-wave-python
-git checkout v0.3.2
+git checkout v0.3.3
 pip install '.[example]' 
 python3 examples/us_bmode_linear_transducer/us_bmode_linear_transducer.py
 ```

kwave/__init__.py

@@ -10,7 +10,7 @@
 
 # Test installation with:
 # python3 -m pip install -i https://test.pypi.org/simple/ --extra-index-url=https://pypi.org/simple/ k-Wave-python==0.3.0
-VERSION = "0.3.2"
+VERSION = "0.3.3"
 # Set environment variable to binaries to get rid of user warning
 # This code is a crutch and should be removed when kspaceFirstOrder
 # is refactored