Merge branch 'androidx-and-sdk29' into 'master'

Update sdk 28 -> 29 and migrate to androidx

See merge request bloodyhealth/drip!302

package.json

@@ -23,7 +23,8 @@
     "tag-release": "node ./tools/bin/tag-release.js",
     "update-changelog": "node ./tools/bin/update-changelog.js",
     "release": "node ./tools/release-wizard.js",
-    "clear": ". scripts/clear.sh"
+    "clear": ". scripts/clear.sh",
+    "postinstall": "npx jetify"
   },
   "dependencies": {
     "@ptomasroos/react-native-multi-slider": "^1.0.0",
@@ -57,11 +58,10 @@
   },
   "devDependencies": {
     "@babel/core": "^7.4.5",
-    "@babel/runtime": "^7.4.5",
     "@babel/register": "^7.0.0",
-    "babel-jest": "^24.8.0",
-    "jest": "^24.8.0",
+    "@babel/runtime": "^7.4.5",
     "babel-eslint": "^10.0.1",
+    "babel-jest": "^24.8.0",
     "basic-changelog": "gitlab:bloodyhealth/basic-changelog",
     "chai": "^4.1.2",
     "detox": "^13.1.1",
@@ -69,11 +69,13 @@
     "eslint": "^5.16.0",
     "eslint-plugin-react": "^7.8.2",
     "jase": "^1.2.0",
+    "jest": "^24.8.0",
+    "jetifier": "^1.6.6",
     "left-pad": "^1.3.0",
     "metro-react-native-babel-preset": "^0.54.1",
-    "react-test-renderer": "16.8.3",
     "mocha": "^5.2.0",
     "react-native-version": "^3.1.0",
+    "react-test-renderer": "16.8.3",
     "readline": "^1.3.0"
   },
   "description": "A menstrual cycle tracking app that's open-source and leaves your data on your phone. Use it to track your menstrual cycle or for fertility awareness!",