Move the vim import to top.

jedi_vim.py

@@ -15,6 +15,7 @@ try:
 except ImportError:
     from itertools import izip_longest as zip_longest  # Python 2
 
+import vim
 
 is_py3 = sys.version_info[0] >= 3
 if is_py3:
@@ -90,7 +91,6 @@ def echo_highlight(msg):
         msg.replace('"', '\\"')))
 
 
-import vim
 try:
     import jedi
 except ImportError as e: