Bump version to 0.3

Author: brandon-rhodes

skyfield/__init__.py

@@ -4,5 +4,5 @@
 functions and classes there.
 
 """
-VERSION = (0, 2)
+VERSION = (0, 3)
 __version__ = '.'.join(map(str, VERSION))

skyfield/documentation/installation.rst

@@ -41,7 +41,7 @@ You can protect your project from any abrupt API changes
 by pinning a specific version of Skyfield
 in your ``requirements.txt`` or ``setup.py`` or install instructions::
 
-    skyfield==0.2
+    skyfield==0.3
 
 By preventing Skyfield from being upgraded
 until you are ready to advance the version number yourself,