update Kotlin

app/build.gradle

@@ -75,7 +75,7 @@ dependencies {
     implementation 'android.arch.persistence.room:runtime:1.0.0'
     kapt 'android.arch.persistence.room:compiler:1.0.0'
 
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 
     testImplementation 'junit:junit:4.12'
 

build.gradle

@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.31'
+    ext.kotlin_version = '1.2.40'
     repositories {
         jcenter()
         google()