Add trailing / to transformIgnorePatterns (#146)

* Add trailing `/` to `transformIgnorePatterns`

Fix a small bug with the `transformIgnorePatterns` suggested fix for performing proper transformations on the mocks for Jest compatibility. Need to add a trailing `/` to the regex for the transform ignore, otherwise it will match all packages in `node-modules` that start with the string `react-native`!

* Further explanation about the transform regex

As suggested by @thymikee

Author: zackdotcomputer

docs/Jest-integration.md

@@ -71,17 +71,18 @@ You can [check its implementation](../jest/async-storage-mock.js) to get more in
 
 You need to point Jest to transform this package. You can do so, by adding Async Storage path to `transformIgnorePatterns` setting in Jest's configuration.
 
-
 ```json
 "jest": {
   "transformIgnorePatterns": ["node_modules/(?!(@react-native-community/async-storage/lib))"]
 }
 ```
 
-Optionally, you can transform whole scope for `react-native-community` and `react-native`:
+Optionally, you can transform all packages in the `react-native-community` and `react-native` directories by specifying this pattern:
 
 ```json
 "jest": {
-  "transformIgnorePatterns": ["node_modules/(?!(@react-native-community|react-native))"]
+  "transformIgnorePatterns": ["node_modules/(?!(@react-native-community|react-native)/)"]
 }
-```
+```
+
+Or you can expand it even further to transform all packages whose names begin with `react-native` by omitting the trailing `/` in the above pattern.