Fixed compiling with minSDK in manifest file error

[dkfl1995]

Does any other open PR do the same thing?

Any

What issue is this PR fixing?

No one. It was my own first.

How did you test this PR?

Android only!
When upgrading to newer gradle wrapper package versions that works with buildtools version 28+, error comes up if uses-sdk tag has "minSDK" property defined inside AndroidMainfest.xml file. Default SDK properties should stand only inside build.gradle files.

My steps to reproduce:
try to compile react-native in Android Studio with:

1. gradle-wrapper package version in gradle-wrapper.properties:
   distributionUrl=https\://services.gradle.org/distributions/gradle-4.9-all.zip
2. App`s build.gradle file buildToolsVersion 28.0.2.
3. Gradle plugin version I used (the newest at that time):

dependencies { classpath 'com.android.tools.build:gradle:3.3.0-alpha08' }

You will receive an gradle sync error:

Error:The minSdk version should not be declared in the android manifest file. You can move the version from the manifest to the defaultConfig in the build.gradle file.