Fix #95: Address Jest moduleDirectories Behavior (#96)

* Fix #95: Address Jest moduleDirectories Behavior

- Use Jest default for moduleDirectories of ['node_modules'] instead of [] when not overridden
- Use a relative path for appPath modules instead of full path which seems to be preferred for Jest

* chore: update some deps in yarn.lock #95

* Revert relative path change.

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Co-authored-by: Serguei Okladnikov <oklaspec@gmail.com>

Author: bryanculver

packages/react-app-alias-ex/src/index.js

@@ -121,7 +121,7 @@ function aliasJest(options) {
     return {
       ...expanded,
       moduleDirectories: [
-        ...(config.moduleDirectories || []),
+        ...(config.moduleDirectories || ['node_modules']),
         path.resolve(paths.appPath, 'node_modules')
       ],
     }