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kotlinlang

Hi all! I have some trouble updating to Kotlin 1.1:

I have plenty of modules which all uses Kotlin, so I defined a `kotlin` configuration `configurations { kotlin }`, I use this configuration to include dependencies 
```
dependencies { 
		kotlin "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion"
		kotlin "org.jetbrains.kotlin:kotlin-compiler:$kotlinVersion" 

}```

And this all is defined inside the allprojects closure:

```
allprojects {

	group 'io.gitlab.arturbosch.detekt'
	version "$detektVersion"

	repositories {
		mavenCentral()
		mavenLocal()
		maven { url "<http://dl.bintray.com/jetbrains/spek>" }
		maven { url "<http://dl.bintray.com/arturbosch/code-analysis>" }
	}
	apply plugin: 'kotlin'

	configurations {
		kotlin
		kotlinTest
		junitPlatform
	}

	dependencies {
		kotlin "org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion"
		kotlin "org.jetbrains.kotlin:kotlin-compiler:$kotlinVersion"
       .....
	}

	sourceSets {
		main.java.srcDirs += 'src/main/kotlin'
	}
}
```

I set the kotlin version through a  gradle.properties file. eg. `kotlinVersion=1.0.7`

When I now change the Version to 1.1.0 or 1.1.1, gradle complains about not finding the method `kotlin`:
```
```