Relax lower bound of http-client dependency

This makes the package compatible with Stackage lts-18.11

Author: zyla

http-proxy.cabal

@@ -46,7 +46,7 @@ library
                       , case-insensitive        >= 1.2
                       , conduit                 == 1.3.*
                       , conduit-extra           == 1.3.*
-                      , http-client             == 0.7.*
+                      , http-client             >= 0.6 && < 0.8
                       , http-conduit            == 2.3.*
                       , http-types              == 0.12.*
                       , mtl                     == 2.2.*

stack.yaml

@@ -2,4 +2,4 @@ flags: {}
 packages:
 - '.'
 extra-deps: []
-resolver: lts-2.21
+resolver: lts-18.11