Track extra-source-files of plugins more accurately

Author: fendor

haskell-language-server.cabal

@@ -22,11 +22,18 @@ extra-source-files:
   test/testdata/**/*.cabal
   test/testdata/**/*.yaml
   test/testdata/**/*.hs
-
-  plugins/**/*.project
-  plugins/**/*.cabal
-  plugins/**/*.yaml
-  plugins/**/*.hs
+  test/testdata/**/*.json
+
+  plugins/**/README.md
+  -- some README's have a .gif showcasing the feature
+  plugins/**/*.gif
+
+  plugins/test/testdata/**/*.expected
+  plugins/test/testdata/**/*.project
+  plugins/test/testdata/**/*.cabal
+  plugins/test/testdata/**/*.yaml
+  plugins/test/testdata/**/*.txt
+  plugins/test/testdata/**/*.hs
 
   bindist/wrapper.in