Remove "=undistributed-packages" note from packages/README

M2/Macaulay2/packages/README

@@ -7,11 +7,10 @@ paging through each node by pressing the "next" button repeatedly.
 Then create an account on github.com and fork our repository
 https://github.com/Macaulay2/M2, clone your copy of M2, and add your package
 file to this "packages" directory, along with its directory of auxiliary files,
-if any.  Also add a line to the end of the file =distributed-packages
-containing the name of your package.  Add those changes, commit them, and push
-them to your repository.  Then on the github page for your copy of M2, push the
-button called "Pull request".  That will notify us that you'd like your
-addition to become part of Macaulay2/M2.
+if any.  Add those changes, commit them, and push them to your repository.
+Then on the github page for your copy of M2, push the button called "Pull
+request".  That will notify us that you'd like your addition to become part of
+Macaulay2/M2.
 
 More advanced users will want to add their new package to a new branch of the
 repository.