npx react-codemod rename-unsafe-lifecycles

[selvagsz]

Fixes #58

npx react-codemod rename-unsafe-lifecycles

• run the codemod
• add react & react-dom as peer dep

peerDependencies: {
  "react": ">=16.3.0",
  "react-dom": ">=16.3.0"
}

• test & release react-power-select@1.0.0 with no other new functionalities

[coveralls]

Coverage remained the same at 81.336% when pulling 7a749eb on refactor/unsafe_lifecycles into 2e8914d on master.