Fix up dependencies for test suite.

ihaskell.cabal

@@ -165,7 +165,7 @@ Test-Suite hspec
                        haskeline            -any,
                        here                 ==1.2.*,
                        hlint                >=1.9 && <2.0,
-                       haskell-src-exts     ==1.15.*,
+                       haskell-src-exts     ==1.16.*,
                        hspec                -any,
                        HUnit                -any,
                        MissingH             >=1.2,
@@ -181,6 +181,8 @@ Test-Suite hspec
                        system-filepath      -any,
                        tar                  -any,
                        text                 >=0.11,
+                       http-client          == 0.4.*,
+                       http-client-tls      == 0.2.*,
                        transformers         -any,
                        unix                 >= 2.6,
                        unordered-containers -any,