Do not symlink a symlink in mkrc

We have a bug when calling mkrc(1) on a symlink:

```sh
mkrc ~/.vimrc # links ~/.vimrc to ~/.dotfiles/vimrc
mkrc ~/.vimrc # deletes ~/.dotfiles/vimrc
```

This catches that case ahead of time, preventing the user from running
mkrc(1) on a symlink.

Fix #144.

1 files changed, 2 insertions, 0 deletions

diff --git a/NEWS.md.in b/NEWS.md.in
index 6af5d4e..4461a2f 100644
--- a/NEWS.md.in
+++ b/NEWS.md.in
@@ -1,5 +1,7 @@
 rcm (@PACKAGE_VERSION@) unstable; urgency=low
 
+  * Fix #144 and more: all symlinks in input are rejected (Mat M)
+  
  -- Mike Burns <mburns@thoughtbot.com>  Fri, 13 Jul 2018 14:12:00 -0500
 
 rcm (1.3.3) unstable; urgency=low