Egor Okhterov

Changing devDependency to `devDependency("@babel/core")` doesn't help. The build of the frontend module is still hanging.

> Should be `devDependency("babel-core")` to `devDependency("@babel/core")` at line 38. This doesn't help. The build still hangs.

``` H:\Projects\kotlin-fullstack-sample>gradlew.bat build > Task :backend:compileKotlin FAILED w: Runtime JAR files in the classpath should have the same version. These files were found in the classpath: C:/Users/e.okhterov/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jdk8/1.3.50/bf65725d4ae2cf00010d84e945fcbc201f590e11/kotlin-stdlib-jdk8-1.3.50.jar (version 1.3) C:/Users/e.okhterov/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-reflect/1.3.50/b499f22fd7c3e9c2e5b6c4005221fa47fc7f9a7a/kotlin-reflect-1.3.50.jar...