Updated android plugin and kotlin version

build.gradle

@@ -1,13 +1,13 @@
 buildscript {
     ext {
-        kotlin_version = '1.2.31'
+        kotlin_version = '1.2.40'
     }
     repositories {
         jcenter()
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.1.1'
+        classpath 'com.android.tools.build:gradle:3.1.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }