v2.0.0-beta2

• 🐛 fix examples (b8c82c0)
• 🐛 fix examples (86d2ef4)
• 📦 Build beta2 (ab562bd)
• Add support for readonly and featured field functions (065d0a7)
• Allow form fields required state to be controlled with a function, (e08dbbb)
• bump version to 2.0.0-beta2 (94347e7)
• fix checkbox tests (593307b)
• Fix some CSS visual bugs (7a786f7)
• fix some errors (8d3ca97)
• Fix vue version in examples (ebfc4b0)
• fix vue-multiselect test errors (2aacb57)
• remove console.log (454fa0e)
• remove v4 from travis (bbdcc0f)
• reorganize dev codes (386fa3f)
• update deps (f4e5709)
• update readme (eb6328c)
• Update README.md (ea91365)
• update travis. Remove v5, add v7 (1d85539)
• update yarn lock (e57725c)
• update yarn lock (df5aca0)