Bump version from 0.3.0 to 0.4.0

Author: wannaphong

setup.py

@@ -9,7 +9,7 @@
 
 setup(
     name="PyThaiTTS",
-    version="0.3.0",
+    version="0.4.0",
     description="Open Source Thai Text-to-speech library in Python",
     long_description=readme,
     long_description_content_type="text/markdown",