[commit: ghc] master: Bump transformers submodule (b41a42e)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/b41a42e3dc0c428344c553e195b7dc91272de21e/ghc

>---------------------------------------------------------------

commit b41a42e3dc0c428344c553e195b7dc91272de21e
Author: Ryan Scott <ryan.gl.scott at gmail.com>
Date:   Fri Apr 20 10:14:31 2018 -0400

    Bump transformers submodule
    
    This brings in a commit which migrates Contravariant instances from
    base to transformers.


>---------------------------------------------------------------

b41a42e3dc0c428344c553e195b7dc91272de21e
 libraries/transformers | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/transformers b/libraries/transformers
index 33b3c8a..8055784 160000
--- a/libraries/transformers
+++ b/libraries/transformers
@@ -1 +1 @@
-Subproject commit 33b3c8a71778ae37040088dfe022c648373777a8
+Subproject commit 80557845cdc0e72bc05cec19cf7a1bf5495e9e69