switched nedb to nedb-promises (#37)

* breaking change: switched to nedb-promises
* Linting
* some dev dependencies
* more tests
* updated package version
* bug fixing
* changed isNaN to isString
* (fix) args[0]

__tests__/functions/findMessage.js

@@ -0,0 +1,6 @@
+require('module-alias/register');
+const { findMessage } = require('@dsabot/findMessage');
+
+it('should capitalize the first letter.', () => {
+    expect(findMessage('ERROR')).toBe('Irgendwas ist schief gelaufen. 🤔');
+});