Remove Sustenance (#614)

Because it is providing almost daily updates without ever increasing
the version number, causing false positives in updates and etc.

The REA contains an older version of Sustenance, so people will still
be able to install it.

META.list

@@ -63,7 +63,6 @@ https://raw.githubusercontent.com/atweiden/digest-xxhash/master/META6.json
 https://raw.githubusercontent.com/atweiden/file-path-resolve/master/META6.json
 https://raw.githubusercontent.com/atweiden/file-presence/master/META6.json
 https://raw.githubusercontent.com/atweiden/mktxn/master/META6.json
-https://raw.githubusercontent.com/atweiden/sustenance/master/META6.json
 https://raw.githubusercontent.com/atweiden/txn-parser/master/META6.json
 https://raw.githubusercontent.com/atweiden/txn-remarshal/master/META6.json
 https://raw.githubusercontent.com/avuserow/perl6-audio-taglib-simple/master/META6.json