bump version, prerelase

Author: planrich

setup.py

@@ -78,7 +78,7 @@
     name='vmprof',
     author='vmprof team',
     author_email='fijal@baroquesoftware.com',
-    version="0.4.1",
+    version="0.4.2.dev0",
     packages=find_packages(),
     description="Python's vmprof client",
     long_description='See https://vmprof.readthedocs.org/',