Drop GHC 7.4 and 7.6 (not supported by gauge)

Author: snoyberg

.travis.yml

@@ -41,12 +41,12 @@ matrix:
   #- env: BUILD=cabal GHCVER=7.2.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
   #  compiler: ": #GHC 7.2.2"
   #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.2.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
-  - env: BUILD=cabal GHCVER=7.4.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
-    compiler: ": #GHC 7.4.2"
-    addons: {apt: {packages: [cabal-install-1.16,ghc-7.4.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
-  - env: BUILD=cabal GHCVER=7.6.3 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
-    compiler: ": #GHC 7.6.3"
-    addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.4.2 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.4.2"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.4.2,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
+  #- env: BUILD=cabal GHCVER=7.6.3 CABALVER=1.16 HAPPYVER=1.19.5 ALEXVER=3.1.7
+  #  compiler: ": #GHC 7.6.3"
+  #  addons: {apt: {packages: [cabal-install-1.16,ghc-7.6.3,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}
   - env: BUILD=cabal GHCVER=7.8.4 CABALVER=1.18 HAPPYVER=1.19.5 ALEXVER=3.1.7
     compiler: ": #GHC 7.8.4"
     addons: {apt: {packages: [cabal-install-1.18,ghc-7.8.4,happy-1.19.5,alex-3.1.7], sources: [hvr-ghc]}}

streaming-commons.cabal

@@ -47,7 +47,7 @@ library
                        Data.Text.Internal.Encoding.Utf16
                        Data.Text.Internal.Encoding.Utf32
 
-  build-depends:       base >= 4.4 && < 5
+  build-depends:       base >= 4.7 && < 5
                      , array
                      , async
                      , blaze-builder >= 0.3 && < 0.5