- Upgraded gradle version.

- Upgraded studio version in readme.

README.md

@@ -13,7 +13,7 @@ After cloning the project, generate static libraries and include files
 to distribution directory using master branch of
 https://github.com/juha-h/libbaresip-android.
 
-Then in Android Studio 3.4.1:
+Then in Android Studio 3.4.2:
 
 - Open an existing Android Studio project
 

build.gradle

@@ -7,7 +7,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.1'
+        classpath 'com.android.tools.build:gradle:3.4.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files