chore: specify MIT license in package.json (#773)

* Fix: the license display incorrectly on npmjs.com

* Update the license field in all the package.json files

Author: KitoHo

package.json

@@ -26,7 +26,7 @@
     "icloud"
   ],
   "author": "Vojtech Novak (hello@react-native-training.eu)",
-  "license": "see LICENSE file",
+  "license": "MIT",
   "bugs": {
     "url": "https://github.com/react-native-documents/document-picker/issues"
   },

packages/document-picker/package.json

@@ -50,7 +50,7 @@
     "url": "git+https://github.com/react-native-documents/document-picker.git"
   },
   "author": "Vojtech Novak (hello@react-native-training.eu)",
-  "license": "see LICENSE file",
+  "license": "MIT",
   "bugs": {
     "url": "https://github.com/react-native-documents/document-picker/issues"
   },

packages/document-viewer/package.json

@@ -48,7 +48,7 @@
     "url": "git+https://github.com/react-native-documents/document-picker.git"
   },
   "author": "Vojtech Novak (hello@react-native-training.eu)",
-  "license": "see LICENSE file",
+  "license": "MIT",
   "bugs": {
     "url": "https://github.com/react-native-documents/document-picker/issues"
   },

packages/example/package.json

@@ -22,7 +22,7 @@
   "private": true,
   "repository": "https://github.com/react-native-documents/sponsors-only",
   "author": "Vojtech Novak (hello@react-native-training.eu)",
-  "license": "see LICENSE file",
+  "license": "MIT",
   "bugs": {
     "url": "https://github.com/react-native-documents/sponsors-only/issues"
   },