diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..9a019e3
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 Miraris
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index f54731b..0b6029d 100755
--- a/README.md
+++ b/README.md
@@ -1,7 +1,14 @@
 # Node AniDB wrapper
 
-[![npm](https://img.shields.io/npm/dm/anidbjs.svg?style=flat-square)](https://www.npmjs.com/package/anidbjs)
-[![Build Status](https://travis-ci.org/miraris/anidbjs.svg?branch=master)](https://travis-ci.org/miraris/anidbjs)
+[![Build Status][travis-svg]][travis-url]
+[![dependency status][deps-svg]][deps-url]
+[![dev dependency status][dev-deps-svg]][dev-deps-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+> A minimalistic AniDB HTTP API wrapper for Node.js.
 
 This module provides a very minimal interface to fetch data from anidb.net. You may want to read the guidelines in the anidb [wiki](http://wiki.anidb.net/w/HTTP_API_Definition) first.
 
@@ -25,3 +32,16 @@ client
   .then(res => console.log(res))
   .catch(err => console.error(err));
 ```
+
+[package-url]: https://npmjs.org/package/anidbjs
+[travis-svg]: https://travis-ci.org/miraris/anidbjs.svg
+[travis-url]: https://travis-ci.org/miraris/anidbjs
+[deps-svg]: https://david-dm.org/miraris/anidbjs.svg
+[deps-url]: https://david-dm.org/miraris/anidbjs
+[dev-deps-svg]: https://david-dm.org/miraris/anidbjs/dev-status.svg
+[dev-deps-url]: https://david-dm.org/miraris/anidbjs#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/anidbjs.png
+[license-image]: http://img.shields.io/npm/l/anidbjs.svg
+[license-url]: LICENSE
+[downloads-image]: http://img.shields.io/npm/dm/anidbjs.svg
+[downloads-url]: http://npm-stat.com/charts.html?package=anidbjs
\ No newline at end of file
diff --git a/lib/utils/index.js b/lib/utils/index.js
index 3ceddd9..e0d2a86 100644
--- a/lib/utils/index.js
+++ b/lib/utils/index.js
@@ -1,9 +1,3 @@
-/**
- * Check whether a value is undefined or empty
- * @param {*} val
- */
-const isNull = val => typeof val === 'undefined' || val == null
-
 /**
  * Ensure the value is an array
  * @param {*} arr
@@ -14,28 +8,19 @@ const ensureArray = arr => (Array.isArray(arr) ? arr : [arr])
  * Try to parse an integer
  * @param {*} number
  */
-const tryParseInt = number => {
-  if (isNull(number)) return
-  return parseInt(number, 10)
-}
+const tryParseInt = number => (number ? parseInt(number, 10) : undefined)
 
 /**
  * Try to parse a float
  * @param {*} number
  */
-const tryParseFloat = number => {
-  if (isNull(number)) return
-  return parseFloat(number, 10)
-}
+const tryParseFloat = number => (number ? parseFloat(number, 10) : undefined)
 
 /**
  * Try to parse a boolean
  * @param {*} bool
  */
-const tryParseBool = bool => {
-  if (isNull(bool)) return
-  return bool === 'true'
-}
+const tryParseBool = bool => bool === 'true'
 
 module.exports = {
   ensureArray,