update plugin.xml for IDEA platform 171.x
update plugin.xml for IDEA platform 171.x

(cherry picked from commit be7326f)

triplequote/intellij-scala,JetBrains/intellij-scala,jastice/intellij-scala,loskutov/intellij-scala,jastice/intellij-scala,JetBrains/intellij-scala,jastice/intellij-scala,ilinum/intellij-scala,loskutov/intellij-scala,triplequote/intellij-scala,ilinum/intellij-scala,ilinum/intellij-scala,triplequote/intellij-scala,jastice/intellij-scala,loskutov/intellij-scala