List modules in alphabetical order, one per line (KSG Cabal 1.3.0 - 3…

….7.2). Refs #196.

Modules listed in fields such as exposed-modules and other-modules
should always be listed in alphabetical order, one module per line.

yampa-test/yampa-test.cabal

@@ -64,11 +64,12 @@ source-repository head
 
 
 library
-  exposed-modules:     FRP.Yampa.Debug
-                       FRP.Yampa.LTLFuture
-                       FRP.Yampa.LTLPast
-                       FRP.Yampa.Stream
-                       FRP.Yampa.QuickCheck
+  exposed-modules:
+    FRP.Yampa.Debug
+    FRP.Yampa.LTLFuture
+    FRP.Yampa.LTLPast
+    FRP.Yampa.QuickCheck
+    FRP.Yampa.Stream
   build-depends:       base >=4 && <5,
                        Yampa >= 0.13.3 && < 0.14,
                        QuickCheck,