Updated package_data to correctly include version.txt.

Author: rstoneback

setup.py

@@ -37,7 +37,7 @@
     # Author details
     author='Russell Stoneback',
     author_email='rstoneba@utdallas.edu',
-    package_data={'pysatMagVect': ['version.txt'],},
+    package_data={'pysatMagVect': ['pysatMagVect/version.txt'],},
     include_package_data=True,
 
     ext_modules = config.todict()['ext_modules'],