[commit: ghc] ghc-8.0: Update transformers submodule to 0.5.1.0 release (251ec58)

[git at git.haskell.org]

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

On branch  : ghc-8.0
Link       : http://ghc.haskell.org/trac/ghc/changeset/251ec5861c06729d40a7ad28f8dd170eb29d6ee0/ghc

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commit 251ec5861c06729d40a7ad28f8dd170eb29d6ee0
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Tue Jan 26 12:03:23 2016 +0100

    Update transformers submodule to 0.5.1.0 release
    
    This shouldn't have any noticeable API changes for GHC
    
    (cherry picked from commit 9b716950e1c9e99afe2840ef804e5b3343ef3653)


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251ec5861c06729d40a7ad28f8dd170eb29d6ee0
 libraries/transformers | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/transformers b/libraries/transformers
index 1a2bc4e..a2f7dd0 160000
--- a/libraries/transformers
+++ b/libraries/transformers
@@ -1 +1 @@
-Subproject commit 1a2bc4ecada9561911e9c2e8a98a3c6bf59b7bb1
+Subproject commit a2f7dd057a0ee0c6cb206609594d7a07d26a1861