#20 Correct Idea version to pass the tests

Author: mximp

gradle.properties

@@ -2,7 +2,7 @@ pluginVersion=0.0.0
 
 # e.g. IC-2016.3.3, IU-2018.2.5 etc
 # For a list of possible values, refer to the section 'com.jetbrains.intellij.idea' at https://www.jetbrains.com/intellij-repository/releases
-ideaVersion=2021.1
+ideaVersion=2018.3.2
 
 # The version of ANTLR v4 that will be used to generate the parser
 antlr4Version=4.10.1

src/main/java/org/eolang/jetbrains/EoCompileAction.java

@@ -31,7 +31,6 @@
 import com.intellij.openapi.actionSystem.DataContext;
 import com.intellij.openapi.project.Project;
 import java.util.Collections;
-import java.util.function.Supplier;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.idea.maven.execution.MavenRunConfigurationType;
 import org.jetbrains.idea.maven.execution.MavenRunnerParameters;