Rolled version into 4.2.0

Author: laserkelvin

setup.py

@@ -198,7 +198,7 @@ def run(self):
 
 setup(
     name="pyspectools",
-    version="4.1.5",
+    version="4.2.0",
     description="A set of Python tools/routines for spectroscopy",
     author="Kelvin Lee",
     packages=find_packages(),