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kotlinlang

Hi,

I found out the issue.
plugins is a array type property, and there are two ways  of doing its assignment.

```
// plugins = ['org.jetbrains.kotlin:1.2.41-release-IJ2017.3-1']    // this works
plugins 'org.jetbrains.kotlin:1.2.41-release-IJ2017.3-1'               //this works
// but the following doesn't. it is not the first time I messed this up
plugins ['org.jetbrains.kotlin:1.2.41-release-IJ2017.3-1']
```

All is ok now.