chore(ci and npm): Setup CircleCI and semantic-release

Setup CircleCI and semantic-release

.circleci/config.yml

+defaults: &defaults
+  working_directory: ~/code
+  docker:
+    - image: circleci/node:10.6.0-browsers
+
+version: 2
+jobs:
+  setup:
+    <<: *defaults
+    steps:
+      - checkout
+      - restore_cache:
+          name: Restore node modules
+          keys:
+            - node_modules-{{ arch }}-{{ checksum "yarn.lock" }}
+
+      - run:
+          name: Install dependencies
+          command: yarn --pure-lockfile
+
+      - save_cache:
+          name: Save node modules
+          key: node_modules-{{ arch }}-{{ checksum "yarn.lock" }}
+          paths:
+            - node_modules
+
+  tests:
+    <<: *defaults
+    steps:
+      - checkout
+      - restore_cache:
+          name: Restore node modules
+          keys:
+            - node_modules-{{ arch }}-{{ checksum "yarn.lock" }}
+
+      - run:
+          name: Run Tests
+          command: yarn ci:test
+
+  publish:
+    <<: *defaults
+    steps:
+      - checkout
+      - restore_cache:
+          name: Restore node modules
+          keys:
+            - node_modules-{{ arch }}-{{ checksum "yarn.lock" }}
+
+      - run:
+          name: Publish to NPM
+          command: yarn ci:publish
+
+workflows:
+  version: 2
+  ci:
+    jobs:
+      - setup
+      - tests:
+          requires:
+            - setup
+      - publish:
+          requires:
+            - tests
+          filters:
+            branches:
+              only: master

.gitignore

 npm-debug.log
 yarn-error.log
 package-lock.json
-yarn.lock
 
 # Rubygem bundles
 #

package.json

   "contributors": [
     "Thibault Malbranche <malbranche.thibault@gmail.com>"
   ],
-  "version": "2.0.0",
+  "version": "0.0.0-development",
   "homepage": "https://github.com/react-native-community/react-native-webview#readme",
   "scripts": {
-    "flow": "flow check",
-    "flow-android": "flow check --flowconfig-name .flowconfig.android"
+    "test:ios:flow": "flow check",
+    "test:android:flow": "flow check --flowconfig-name .flowconfig.android",
+    "ci:publish": "yarn semantic-release",
+    "ci:test": "yarn ci:test:flow",
+    "ci:test:flow": "yarn test:ios:flow && yarn test:android:flow",
+    "semantic-release": "semantic-release"
   },
   "peerDependencies": {
     "react": "^16.0",
   },
   "devDependencies": {
     "flow-bin": "^0.80.0",
-    "react-native": "^0.57"
+    "react-native": "^0.57",
+    "semantic-release": "^15.9.17"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/react-native-community/react-native-webview.git"
   }
 }