remote-helpers: point at their upstream repositories

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

contrib/remote-helpers/README

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+The remote-helper bridges to access data stored in Mercurial and
+Bazaar are maintained outside the git.git tree in the repositories
+of its primary author:
+
+    https://github.com/felipec/git-remote-hg (for Mercurial)
+    https://github.com/felipec/git-remote-bzr (for Bazaar)
+
+You can pick a directory on your $PATH and download them from these
+repositories, e.g.:
+
+  $ wget -O $HOME/bin/git-remote-hg \
+    https://raw.github.com/felipec/git-remote-hg/master/git-remote-hg
+  $ wget -O $HOME/bin/git-remote-bzr \
+    https://raw.github.com/felipec/git-remote-bzr/master/git-remote-bzr
+  $ chmod +x $HOME/bin/git-remote-hg $HOME/bin/git-remote-bzr
+
+As a convenience, copies of the last-bundled version of these two
+remote-helper bridges are still kept here, but they may become
+stale over time.