hlint: add HLint.hs link

diff --git a/src/HLint.hs b/src/HLint.hs
new file mode 120000 (symlink)
index 0000000..ab18269
--- /dev/null
+++ b/src/HLint.hs
@@ -0,0 +1 @@
+../HLint.hs
\ No newline at end of file