Support TypeScript 3.7 (#85)

TypeScript 3.7 introduces nullish coalescing, optional chaining, and some other new syntax. To avoid false positives (nonsense lint warnings) due to prettier and other packages not understanding the new syntax, some packages need to be bumped.

Author: matthargett

package.json

@@ -13,26 +13,26 @@
   ],
   "dependencies": {
     "babel-eslint": "^10.0.3",
-    "eslint-config-prettier": "^6.4.0",
-    "eslint-plugin-flowtype": "^4.3.0",
+    "eslint-config-prettier": "^6.5.0",
+    "eslint-plugin-flowtype": "^4.4.1",
     "eslint-plugin-import": "^2.18.2",
-    "eslint-plugin-jest": "^22.20.0",
+    "eslint-plugin-jest": "^23.0.3",
     "eslint-plugin-prettier": "^3.1.1",
     "eslint-plugin-promise": "^4.2.1",
     "eslint-plugin-react": "^7.16.0",
     "eslint-plugin-react-hooks": "^2.2.0",
     "eslint-plugin-react-native": "^3.8.1",
     "eslint-restricted-globals": "^0.2.0",
-    "prettier": "^1.18.2"
+    "prettier": "^1.19.1"
   },
   "peerDependencies": {
     "eslint": ">=6"
   },
   "devDependencies": {
-    "@typescript-eslint/eslint-plugin": "^2.5.0",
-    "@typescript-eslint/parser": "^2.5.0",
-    "eslint": "^6.5.1",
-    "typescript": "^3.5.2"
+    "@typescript-eslint/eslint-plugin": "^2.7.0",
+    "@typescript-eslint/parser": "^2.7.0",
+    "eslint": "^6.6.0",
+    "typescript": "^3.7.2"
   },
   "scripts": {
     "test": "yarn --cwd test && yarn --cwd test eslint --ext .js,.ts,.tsx ."