Make cabals bound more consistent

Specifically, allow point-updates to hasql-notifications, and
give a reasonable lower bound for network (the version that comess
with GHC 8.0 on stackage).

postgrest.cabal

@@ -104,24 +104,24 @@ library
 executable postgrest
   main-is:            Main.hs
   hs-source-dirs:     main
-  build-depends:      base              >= 4.9 && < 4.15
-                    , auto-update       >= 0.1.4 && < 0.2
-                    , base64-bytestring >= 1 && < 1.3
-                    , bytestring        >= 0.10.8 && < 0.11
-                    , directory         >= 1.2.6 && < 1.4
-                    , either            >= 4.4.1 && < 5.1
-                    , hasql             >= 1.4 && < 1.5
-                    , hasql-pool        >= 0.5 && < 0.6
-                    , hasql-transaction >= 0.7.2 && < 1.1
-                    , hasql-notifications == 0.1.0.0
-                    , network           < 3.2
+  build-depends:      base                >= 4.9 && < 4.15
+                    , auto-update         >= 0.1.4 && < 0.2
+                    , base64-bytestring   >= 1 && < 1.3
+                    , bytestring          >= 0.10.8 && < 0.11
+                    , directory           >= 1.2.6 && < 1.4
+                    , either              >= 4.4.1 && < 5.1
+                    , hasql               >= 1.4 && < 1.5
+                    , hasql-pool          >= 0.5 && < 0.6
+                    , hasql-transaction   >= 0.7.2 && < 1.1
+                    , hasql-notifications >= 0.1 && < 0.2
+                    , network             >= 2.6 && < 3.2
                     , postgrest
-                    , protolude         >= 0.3 && < 0.4
-                    , retry             >= 0.7.4 && < 0.9
-                    , text              >= 1.2.2 && < 1.3
-                    , time              >= 1.6 && < 1.11
-                    , wai               >= 3.2.1 && < 3.3
-                    , warp              >= 3.2.12 && < 3.4
+                    , protolude           >= 0.3 && < 0.4
+                    , retry               >= 0.7.4 && < 0.9
+                    , text                >= 1.2.2 && < 1.3
+                    , time                >= 1.6 && < 1.11
+                    , wai                 >= 3.2.1 && < 3.3
+                    , warp                >= 3.2.12 && < 3.4
   default-language:   Haskell2010
   default-extensions: OverloadedStrings
                       QuasiQuotes