Update package to v1.0a4

Author: MatthewFilipovich

setup.py

@@ -5,7 +5,7 @@
 
 setuptools.setup(
     name="pycharge",
-    version="1.0a3",
+    version="1.0a4",
     author="Matthew Filipovich",
     author_email="matthew.filipovich@queensu.ca",
     description="Electrodynamics simulator for calculating the fields and potentials generated by moving point charges and simulating oscillating dipoles.",