Resolve warnings and build errors and build against recent stack lts

.gitignore

@@ -3,3 +3,5 @@
 build/
 examples/*py
 __pycache__
+dist-newstyle
+*ghc.environment*

servant-py.cabal

@@ -5,12 +5,12 @@ description:
   Automatically derive python functions to query servant webservices.
   .
   Supports deriving functions using Python's requests library.
-homepage:            https://github.com/pellagic-puffbomb/servant-py#readme
+homepage:            https://github.com/erewok/servant-py#readme
 license:             BSD3
 license-file:        LICENSE
 author:              Erik Aker
 maintainer:          [email protected]
-copyright:           2017 Erik Aker
+copyright:           2019 Erik Aker
 category:            Web
 build-type:          Simple
 extra-source-files:  README.md
@@ -89,4 +89,4 @@ test-suite servant-py-test
 
 source-repository head
   type:     git
-  location: https://github.com/pellagic-puffbomb/servant-py
+  location: https://github.com/erewok/servant-py

src/Servant/PY/Internal.hs

@@ -37,44 +37,14 @@ module Servant.PY.Internal
   , functionArguments
   , formatBuilder
   , remainingReqCall
-  -- re-exports
-  , (:<|>)(..)
-  , (:>)
-  , defReq
-  , reqHeaders
-  , HasForeign(..)
-  , HasForeignType(..)
-  , GenerateList(..)
-  , NoTypes
-  , ArgType(..)
-  , HeaderArg(..)
-  , QueryArg(..)
-  , Req(..)
-  , Segment(..)
-  , SegmentType(..)
-  , Url(..)
-  , Path
-  , Arg(..)
-  , FunctionName(..)
-  , PathSegment(..)
-  , concatCase
-  , snakeCase
-  , camelCase
-  , ReqBody
-  , JSON
-  , FormUrlEncoded
-  , Post
-  , Get
-  , Raw
-  , Header
   ) where
 
 import           Control.Lens                  hiding (List)
 import qualified Data.CharSet                  as Set
 import qualified Data.CharSet.Unicode.Category as Set
 import           Data.Data
 import           Data.Maybe                    (isJust)
-import           Data.Monoid()
+import           Data.Monoid                   ( (<>) )
 import           Data.Text                     (Text)
 import qualified Data.Text                     as T
 import           Data.Text.Encoding            (decodeUtf8)

src/Servant/PY/Requests.hs

@@ -1,6 +1,6 @@
 module Servant.PY.Requests where
 
-import           Data.Monoid()
+import           Data.Monoid         ( (<>) )
 import           Data.Proxy
 import           Data.Text           (Text)
 import qualified Data.Text           as T

stack.yaml

@@ -2,7 +2,7 @@
 # For more information, see: http://docs.haskellstack.org/en/stable/yaml_configuration/
 
 # Specifies the GHC version and set of packages available (e.g., lts-3.5, nightly-2015-09-21, ghc-7.10.2)
-resolver: lts-7.19
+resolver: lts-12.20
 
 # Local packages, usually specified by relative directory name
 packages: