Specify react-native-safe-area-context dependency explicitly

It's not guaranteed as a peer dependency until `@react-navigation/core@4`, which is still in alpha

Author: Ashoat

package.json

@@ -10,7 +10,8 @@
     "type": "git"
   },
   "dependencies": {
-    "invariant": "^2.2.2"
+    "invariant": "^2.2.2",
+    "react-native-safe-area-context": "^0.3.6"
   },
   "devDependencies": {
     "flow-bin": "^0.108.0",

yarn.lock

@@ -105,6 +105,11 @@ prop-types@^15.6.0:
     loose-envify "^1.3.1"
     object-assign "^4.1.1"
 
+react-native-safe-area-context@^0.3.6:
+  version "0.3.6"
+  resolved "https://registry.yarnpkg.com/react-native-safe-area-context/-/react-native-safe-area-context-0.3.6.tgz#666bf581b59aa49a9685aea4e76dfd6e1c8a8a52"
+  integrity sha512-5wlaJplOlWxBNnjmCtY/FAlsgRDuoKzmLQzbWUw4NDuOa3H2uq1kTdqTWOw78Nzm5FRqGWe1ZSLWU9+nSaN+vA==
+
 react@^16.4.0:
   version "16.4.0"
   resolved "https://registry.yarnpkg.com/react/-/react-16.4.0.tgz#402c2db83335336fba1962c08b98c6272617d585"