Bumping 3 dependencies

tls >=1.5.7 && <2.0 (latest: 2.0.0)
warp >=3.3.20 && <3.4 (latest: 3.4.0)
zlib >=0.6.2 && <0.7 (latest: 0.7.0.0)

keter.cabal

@@ -64,7 +64,7 @@ library
       template-haskell >=2.17.0 && <3.0,
       text >=1.2.5 && <3.0,
       time >=1.9.3 && <2.0,
-      tls >=1.5.7 && <2.0,
+      tls >=1.5.7 && <2.0 || ^>=2.0.0,
       tls-session-manager >=0.0.4 && <0.1,
       transformers >=0.5.6 && <0.7,
       unix >=2.7.2 && <2.9,
@@ -75,10 +75,10 @@ library
       wai >=3.2.3 && <3.3,
       wai-app-static >=3.1 && <3.2,
       wai-extra >=3.0.3 && <3.2,
-      warp >=3.3.20 && <3.4,
+      warp >=3.3.20 && <3.4 || ^>=3.4.0,
       warp-tls >=3.0.3 && <3.4.0 || ^>=3.4.0,
       yaml >=0.8.4 && <0.12,
-      zlib >=0.6.2 && <0.7
+      zlib >=0.6.2 && <0.7 || ^>=0.7.0
 
   if impl(ghc <7.6)
     build-depends: ghc-prim