fixed reading out VERSION

MANIFEST.in

@@ -2,3 +2,4 @@ include Makefile
 include src/*.c
 include include/*.h
 include README.md
+include VERSION

setup.py

@@ -21,6 +21,8 @@ def version():
     with open("VERSION") as file:
         return file.read().strip()
 
+VERSION_NUMBER = version()
+
 # Functions
 def readme():
     """Opens readme file and returns content"""
@@ -232,7 +234,7 @@ class CustomBuildCommand(distutils.command.build.build):
 
 setup(
     name="binarycpython",
-    version=version(),
+    version=VERSION_NUMBER,
     description="""This is a python API for binary_c (versions {}) by David Hendriks, Rob Izzard and collaborators. Based on the initial set up by Jeff andrews.""".format(
         ",".join(REQUIRED_BINARY_C_VERSIONS),
         ",".join(REQUIRED_BINARY_C_VERSIONS),