Using cli 4.0 RC.0 we run into an error for android release build

**Description:**
We are testing your **4.0 RC** cli as requested in the readme file :smile:
We have an ionic 3.9.2 app, but doing a simple android release build does not work for us, this is what we have done:
```
sudo npm i -g ionic@rc
ionic cordova build android --release
```

**Steps to Reproduce:**
If we do a UNSIGNED release on a fresh IONIC3 app with your new CLI 4 RC.0 we do not get the error, not sure if the problem is the app, cordova or the SIGNING method. But for sure the problem is only on `--release` tag

But if we revert to @latest cli the build is working again.

**Output:**
This is our output what we get
```
FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':transformDexWithDexForRelease'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException:
java.util.concurrent.ExecutionException: com.android.dex.DexException: Multiple dex files define
Lcom/google/android/gms/actions/ItemListIntents;

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 8s
36 actionable tasks: 3 executed, 33 up-to-date
(node:17264) UnhandledPromiseRejectionWarning: Error:
/home/michi/software/workspace/web-client-ionic/platforms/android/gradlew: Command failed with exit code 1 Error output:
FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':transformDexWithDexForRelease'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException:
java.util.concurrent.ExecutionException: com.android.dex.DexException: Multiple dex files define
Lcom/google/android/gms/actions/ItemListIntents;

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

* Get more help at https://help.gradle.org

BUILD FAILED in 8s
at ChildProcess.whenDone
(/home/michi/software/workspace/web-client-ionic/platforms/android/cordova/node_modules/cordova-common/src/superspawn.js:169:23)
at emitTwo (events.js:126:13)
at ChildProcess.emit (events.js:214:7)
at maybeClose (internal/child_process.js:925:16)
at Socket.stream.socket.on (internal/child_process.js:346:11)
at emitOne (events.js:116:13)
at Socket.emit (events.js:211:7)
at Pipe._handle.close [as _onclose] (net.js:567:12)
(node:17264) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing
inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch().
(rejection id: 1)
(node:17264) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise
rejections that are not handled will terminate the Node.js process with a non-zero exit code.
```

**My `ionic info`:**
```
cli packages: (/usr/lib/node_modules)
@ionic/cli-utils : 2.0.0-rc.0
ionic (Ionic CLI) : 4.0.0-rc.0

global packages:
cordova (Cordova CLI) : 8.0.0

local packages:
@ionic/app-scripts : 3.1.8
Cordova Platforms : android 6.4.0
Ionic Framework : ionic-angular 3.9.2

System:
Android SDK Tools : 26.1.1
NodeJS : v8.10.0
npm : 5.7.1
OS : Linux 4.13

Environment Variables:
ANDROID_HOME : /abc/android/sdk
```