• BREAKING CHANGE: removed all the underscores _ prefixes from properties
• converted source code to ES2015
• build now uses Rollup
• moved from JSHint to ESLint
• updated npm dependencies
• BREAKING CHANGE: removed parse method from core library, you can't automatically create popper's markup using Popper.js core
• BREAKING CHANGE: simplified modifiers API, see #62 for migration instructions
• BREAKING CHANGE: modifiers options are now stored inside the modifiers configurations, see #62