0.9.0.0

• GHC 8.6.5 preliminary support added via the nightly build (@alanz)
• Resolver bumped, LTS 13.19 for GHC 8.6.4 (@alanz)
• Add diagnosticsOnChange config parameter, default True
  (preserving prior hie behaviour). Setting it False only generates
  diagnostics on file save. (#1164, @mpickering/@lorenzo)
• The Hsimport plugin now formats the resulting change using the
  formatter configured for hie. (#1167,@fendor)
• Actually enable type definition requests, if supported by the client
  (e.g. vscode). (#1169/@fendor, #1172/@bubba)
• Use LSP MarkupContent for generated documentation (#1181, @alanz)
• remove installation of Cabal by cabal (#1184, @power-fungus)
• Add EmptyDataDecls to available pragmas, for generating code actions
  to insert if needed. (#1187,@fendor)
• Make sure the end of formatted text is properly indicated for marked
  up documentation (#1189, @alanz)
• Fix some of the tests with cabal new-build (#1194, @michaelpj)
• Update build-tool-depends for func-test (#1198, @bubba)
• Fix version of lsp-test so cabal new-build works (#1211, @power-fungus)
• Bump hlint to 2.1.17 (#1213, @alanz)
• Use cabal helper that searches with exe extension on windows (#1217, @alanz)

Stability improvements

• Avoid crash in case of nonsensical hoogle db (#1174, @fendor)
• Prevent hie crash if apply-refact crashes (#1220, @Hogeyama)

Documentation improvements

• Improve code documentation about formatters (#1165,@fendor)
• Add code documentation for the Hoogle plugin (#1173,@fendor)
• Change 'build-docs' to 'build-doc' in README (#1185, @ajeetdsouza)
• README Nix - replace old.postFixup -> postFixup (#1193, @backuitist)
• Expand documentation on the build system (#1200, @power-fungus)
• Fixed a typo. (#1212, @rashadg1030)
• Add documentation about building hie with profiling
  enabled. (#1225, @skress)
• Add Documentation for Pragmas Plugin (#1222, @fendor)

Build system improvements

• Further improvements and simplification of the ./install.hs
  build system (#1168, @power-fungus)