Giving up on support for GHC 7.6

Author: trskop

.travis.yml

@@ -7,10 +7,6 @@ sudo: false
 
 matrix:
   include:
-    - env: CABALVER=1.16 GHCVER=7.6.3
-      addons:
-        apt: {packages: [cabal-install-1.16, ghc-7.6.3],  sources: [hvr-ghc]}
-
     - env: CABALVER=1.18 GHCVER=7.8.4
       addons:
         apt: {packages: [cabal-install-1.18, ghc-7.8.4],  sources: [hvr-ghc]}
@@ -40,8 +36,6 @@ script:
   # Option -fpedantic turns on additional wornings in addition to -Wall.
   - cabal configure -fpedantic
   - cabal build
-  - cabal configure -fpedantic --enable-tests
-  - cabal build
   - cabal test
 
   # Following line tests if sdist package is created correctly.

dht-api.cabal

@@ -50,7 +50,7 @@ library
     , RankNTypes
 
   build-depends:
-      base >=4.6 && <5
+      base >=4.7 && <5
 
     , bytestring ==0.10.*
     , data-default-class ==0.0.*
@@ -109,7 +109,7 @@ test-suite unit-tests
 
   build-depends:
     -- {{{ Dependencies of library --------------------------------------------
-      base >=4.6 && <5
+      base >=4.7 && <5
     , bytestring ==0.10.*
     , data-default-class ==0.0.*
     , exceptions >=0.7 && <0.9