upgrade packages and use rollup for build

Author: bluebill1049

.babelrc

@@ -1,11 +1,8 @@
 {
-  "presets": [
-    "flow",
-    "es2015",
-    "react",
-    "stage-0"
-  ],
+  "presets": ["@babel/preset-flow", "@babel/preset-env", "@babel/preset-react"],
   "plugins": [
-    "babel-plugin-transform-flow-strip-types"
+    "@babel/plugin-transform-flow-strip-types",
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-proposal-optional-chaining"
   ]
-}
+}

.eslintrc

@@ -8,7 +8,24 @@
     "global-require": 0,
     "max-len": 0,
     "no-underscore-dangle": 0,
-    "import/first": 0
+    "import/first": 0,
+    "indent": 0,
+    "import/no-named-as-default": 0,
+    "no-plusplus": 0,
+    "arrow-parens": 0,
+    "no-console": 0,
+    "implicit-arrow-linebreak": 0,
+    "prefer-destructuring": 0,
+    "operator-linebreak": 0,
+    "object-curly-newline": 0,
+    "function-paren-newline": 0,
+    "react/destructuring-assignment": 0,
+    "react/require-default-props": 0
+  },
+  "env": {
+    "browser": true,
+    "node": true,
+    "jest": true
   },
   "parser": "babel-eslint",
   "plugins": ["flowtype"]

example/package.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "react": "^16.4.2",
     "react-dom": "^16.4.2",
-    "react-flip-numbers": "2.0.0",
+    "react-flip-numbers": "2.1.0-beta.1",
     "react-scripts": "1.1.4",
     "react-simple-animate": "2.0.0"
   },