remove unused dependencies

package.yaml

@@ -13,7 +13,6 @@ dependencies:
   - universum
   - aeson
   - bytestring
-  - mtl
   - text
 
 library:
@@ -29,7 +28,6 @@ library:
     - regex-tdfa
     - extra
     - deepseq
-    - witherable
     - dotgen
     - text-metrics
     - uri-encode

walint.cabal

@@ -49,7 +49,6 @@ library
     , extra
     , filepath
     , getopt-generics
-    , mtl
     , network-uri
     , regex-tdfa
     , text
@@ -58,7 +57,6 @@ library
     , universum
     , uri-encode
     , vector
-    , witherable
   default-language: Haskell2010
 
 executable walint
@@ -77,7 +75,6 @@ executable walint
     , base
     , bytestring
     , getopt-generics
-    , mtl
     , process
     , template-haskell
     , text
@@ -115,7 +112,6 @@ executable walint-server
     , http-types
     , lucid
     , microlens-platform
-    , mtl
     , process
     , servant
     , servant-client