Update README.md [ci skip]

Author: emprice

remote/README.md

@@ -1,3 +1,7 @@
 Place tools useful for running remotely here. Currently, ``setup.sourceme`` will 
 create a virtualenv Python with all the ``cloud-kepler`` dependencies and
 activate it; the virtualenv can be re-used in later sessions.
+
+Another tool in this directory, ``fetchall.sh``, will perform a fetch on all
+available git branches and set up tracking correctly. This is sometimes useful
+on remote systems but may not be necessary.