Fix cabal check warnings

Author: jneira

plugins/hls-refine-imports-plugin/hls-refine-imports-plugin.cabal

@@ -1,7 +1,9 @@
-cabal-version:      2.2
+cabal-version:      2.4
 name:               hls-refine-imports-plugin
 version:            1.0.0.1
 synopsis:           Refine imports plugin for Haskell Language Server
+description:
+  Please see the README on GitHub at <https://github.com/haskell/haskell-language-server#readme>
 license:            Apache-2.0
 license-file:       LICENSE
 author:             rayshih