Exclude test files from published package

Fixes module resolution issues reported in #5 by preventing
TypeScript from compiling test files into the dist directory.

Author: janne

package.json

@@ -1,6 +1,6 @@
 {
   "name": "pluscodes",
-  "version": "3.0.0",
+  "version": "3.0.1",
   "description": "Library to encode and decode Open Location Codes (Plus Codes) with support for 2-15 digit precision",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",

tsconfig.json

@@ -8,5 +8,13 @@
     "sourceMap": true,
     "outDir": "./dist",
     "strict": true
-  }
+  },
+  "include": [
+    "src/**/*"
+  ],
+  "exclude": [
+    "**/*.spec.ts",
+    "dist",
+    "node_modules"
+  ]
 }