Removed extra newline

From Python 3 docs, [print()](https://docs.python.org/3/library/functions.html#print) accepts a end keyword argument, which determines the last character to be printed, setting it to `''` empty string to prevent extra newlines.

conda_env/cli/main_export.py

@@ -112,7 +112,7 @@ def execute(args, parser):
         env.add_channels(args.channel)
 
     if args.file is None:
-        stdout_json(env.to_dict()) if args.json else print(env.to_yaml())
+        stdout_json(env.to_dict()) if args.json else print(env.to_yaml(), end='')
     else:
         fp = open(args.file, 'wb')
         env.to_dict(stream=fp) if args.json else env.to_yaml(stream=fp)