Bump sbt-idea-plugin to 0.3.1
Bump sbt-idea-plugin to 0.3.1

Fix #194

LPTK/intellij-scala,SergeevPavel/intellij-scala,LPTK/intellij-scala,JetBrains/intellij-scala-historical,JetBrains/intellij-scala-historical,SergeevPavel/intellij-scala,LPTK/intellij-scala,SergeevPavel/intellij-scala,JetBrains/intellij-scala-historical