Remove the dev prefix for final release (#613)

Author: mattdangerw

keras_nlp/__init__.py

@@ -18,4 +18,4 @@
 from keras_nlp import tokenizers
 from keras_nlp import utils
 
-__version__ = "0.4.0.dev0"
+__version__ = "0.4.0"

setup.py

@@ -29,7 +29,7 @@
     ),
     long_description=README,
     long_description_content_type="text/markdown",
-    version="0.4.0.dev0",
+    version="0.4.0",
     url="https://github.com/keras-team/keras-nlp",
     author="Keras team",
     author_email="[email protected]",