fix: remove 2020.2.1 verifier ide version

Author: si9ma

gradle.properties

@@ -8,7 +8,7 @@ pluginSinceBuild = 193
 pluginUntilBuild = 203.*
 # Plugin Verifier integration -> https://github.com/JetBrains/gradle-intellij-plugin#plugin-verifier-dsl
 # See https://jb.gg/intellij-platform-builds-list for available build versions
-pluginVerifierIdeVersions = 2020.2.1, 2020.1.4, 2020.2.3, 2020.3
+pluginVerifierIdeVersions = 2020.1.4, 2020.2.3, 2020.3
 
 platformType = IC
 platformVersion = 2020.1