Remove package.yaml

This reduces duplication between the modified cabal file and
package.yaml.

graphql.cabal

@@ -1,11 +1,5 @@
 cabal-version: 2.2
 
--- This file has been generated from package.yaml by hpack version 0.33.0.
---
--- see: https://github.com/sol/hpack
---
--- hash: dcf3c9aaaaef892c7f75781a0c181c77477fc5bb2757704494c398b99f7fb1c7
-
 name:           graphql
 version:        0.11.1.0
 synopsis:       Haskell GraphQL implementation

package.yaml

@@ -1,68 +0,0 @@
-name: graphql
-version: 0.11.1.0
-synopsis: Haskell GraphQL implementation
-description:
-  Haskell <https://spec.graphql.org/June2018/ GraphQL> implementation.
-maintainer: belka@caraus.de
-git: git://caraus.tech/pub/graphql.git
-homepage: https://www.caraus.tech/projects/pub-graphql
-bug-reports: https://www.caraus.tech/projects/pub-graphql/issues
-category: Language
-license: MPL-2.0 AND BSD-3-Clause
-
-copyright:
-- (c) 2019-2021 Eugen Wissner
-- (c) 2015-2017 J. Daniel Navarro
-author:
-- Danny Navarro <j@dannynavarro.net>
-- Matthías Páll Gissurarson <mpg@mpg.is>
-- Sólrún Halla Einarsdóttir <she@mpg.is>
-
-license-file:
-- LICENSE
-- LICENSE.MPL
-extra-source-files:
-- CHANGELOG.md
-- README.md
-
-dependencies:
-- aeson
-- base >= 4.7 && < 5
-- conduit
-- containers
-- exceptions
-- hspec-expectations
-- megaparsec
-- parser-combinators
-- scientific
-- text
-- transformers
-- unordered-containers
-- vector
-
-library:
-  source-dirs: src
-  other-modules:
-  - Language.GraphQL.Execute.Execution
-  - Language.GraphQL.Execute.Subscribe
-  - Language.GraphQL.Execute.Transform
-  - Language.GraphQL.Type.Definition
-  - Language.GraphQL.Type.Internal
-  - Language.GraphQL.Validate.Rules
-
-tests:
-  graphql-test:
-    main: Spec.hs
-    source-dirs: tests
-    ghc-options:
-    - -threaded
-    - -rtsopts
-    - -with-rtsopts=-N
-    dependencies:
-    - graphql
-    - hspec
-    - hspec-megaparsec
-    - QuickCheck
-    - raw-strings-qq
-    generated-other-modules:
-    - Paths_graphql

stack.yaml

@@ -1,4 +1,4 @@
-resolver: lts-17.6
+resolver: lts-17.9
 
 packages:
 - .