Bump upper bound on base to < 4.13 (#7)

RyanGlScott · web-flow · commit 33a36c33de15 · 2018-04-10T09:10:05.000-04:00
See https://ghc.haskell.org/trac/ghc/ticket/15018.
diff --git a/stm.cabal b/stm.cabal
@@ -43,7 +43,7 @@ library
         other-extensions: Safe
 
     build-depends:
-        base  >= 4.3 && < 4.12,
+        base  >= 4.3 && < 4.13,
         array >= 0.3 && < 0.6
 
     exposed-modules:
