Change CONTRIBUTING.md symink to plain file

The symlink doesn't work, so just replace it with a file containing the
HACKING URL instead.

Signed-off-by: Rob Browning <rlb@defaultvalue.org>

diff --git a/.github/CONTRIBUTING b/.github/CONTRIBUTING
new file mode 100644 (file)
index 0000000..f779d60
--- /dev/null
+++ b/.github/CONTRIBUTING
@@ -0,0 +1,3 @@
+
+https://github.com/bup/bup/blob/master/HACKING
+

diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
deleted file mode 120000 (symlink)
index cc8063b..0000000
--- a/.github/CONTRIBUTING.md
+++ /dev/null
@@ -1 +0,0 @@
-../HACKING
\ No newline at end of file