2.0.0-beta.0

• Fixed deprecation warning in future React 16.4 (replaced componentWillReceiveProps with componentDidUpdate)
• Removed ES module to avoid confusion with default import in some environments
• Added beforeMaskedValueChange property to allow to implement custom masking logic
• Log error into console if maxLength property is defined on masked input (#128)
• Fixed cimoatibility with IE8 (why drop legacy if it's easy to support)
• Fixed cursor position after deleting range that includes mask prefix
• Fixed cursor position on backspace over permanent character on platforms with broken keydown event
• Fixed inconsistent behavior between typing and pasting the same character over mask prefix
• A lot of refactoring (thanks to @TrySound)