chore(cli): Add the LICENSE file to the tree-sitter-cli npm package

LICENSE

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2018 Max Brunsfeld
+Copyright (c) 2018-2021 Max Brunsfeld
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

cli/npm/.gitignore

@@ -2,3 +2,4 @@ tree-sitter
 tree-sitter.exe
 *.gz
 *.tgz
+LICENSE

cli/npm/package.json

@@ -14,7 +14,8 @@
   ],
   "main": "lib/api/index.js",
   "scripts": {
-    "install": "node install.js"
+    "install": "node install.js",
+    "prepack": "cp ../../LICENSE ."
   },
   "bin": {
     "tree-sitter": "cli.js"