Bump 'cabal-version' to >= 1.10, required for hackage

shelly.cabal

@@ -24,10 +24,10 @@ Homepage:            https://github.com/yesodweb/Shelly.hs
 License:             BSD3
 License-file:        LICENSE
 Author:              Greg Weber, Petr Rockai
-Maintainer:          Greg Weber <[email protected]>
+Maintainer:          Greg Weber <[email protected]>, Andreas Abel
 Category:            Development
 Build-type:          Simple
-Cabal-version:       >=1.8
+Cabal-version:       >=1.10
 
 tested-with:
   GHC == 8.0.2
@@ -97,7 +97,8 @@ Library
   cpp-options:
     -DNO_PRELUDE_CATCH
 
-  extensions:
+  default-language: Haskell2010
+  default-extensions:
     CPP
 
 source-repository head
@@ -136,7 +137,8 @@ Test-Suite shelly-testsuite
     -funbox-strict-fields
     -fno-warn-type-defaults
 
-  extensions:
+  default-language: Haskell2010
+  default-extensions:
     OverloadedStrings
     ExtendedDefaultRules
 
@@ -159,7 +161,7 @@ Test-Suite shelly-testsuite
     , hspec-contrib
     , HUnit                     >= 1.2.5.2
 
-  extensions:
+  default-extensions:
     CPP
 
 Flag build-examples
@@ -172,36 +174,39 @@ Flag build-examples
 Executable drain
   hs-source-dirs: test/examples
   main-is: drain.hs
+  default-language: Haskell2010
   if flag(build-examples)
     buildable: True
 
     build-depends: base
                  , shelly
                  , text
 
-    extensions:
+    default-extensions:
       CPP
   else
     buildable: False
 
 Executable run-handles
   hs-source-dirs: test/examples
   main-is: run-handles.hs
+  default-language: Haskell2010
   if flag(build-examples)
     buildable: True
 
     build-depends: base
                  , shelly
                  , text
 
-    extensions:
+    default-extensions:
       CPP
   else
     buildable: False
 
 Executable Color
   hs-source-dirs: test/examples
   main-is: color.hs
+  default-language: Haskell2010
   if flag(build-examples)
     buildable: True