perf(npm): remove superfluous files from npm package (#328)

* perf(npm): remove superfluous files from npm package

* test: fix TS tests to point to the right file

Author: sheerlox

.npmignore

@@ -3,7 +3,7 @@
   "version": "4.8.1",
   "description": "Node.js library for parsing crontab instructions",
   "main": "lib/parser.js",
-  "types": "index.d.ts",
+  "types": "types/index.d.ts",
   "typesVersions": {
     "<4.1": {
       "*": [
@@ -81,5 +81,11 @@
         "dom"
       ]
     }
-  }
+  },
+  "files": [
+    "lib",
+    "types",
+    "LICENSE",
+    "README.md"
+  ]
 }

index.d.ts

@@ -8,7 +8,7 @@ import {
     parseString,
     fieldsToExpression,
     StringResult
-} from '../index';
+} from '../types';
 
 const interval = parseExpression('0 1 2 3 * 1-3,5');
 const intervalIterator = parseExpression('0 1 2 3 * 1-3,5', {iterator: true});