(#248) LSP: use the lowercase language id

Author: ForNeVeR

src/main/kotlin/com/intellij/plugin/powershell/lang/PowerShellLanguage.kt

@@ -2,15 +2,15 @@ package com.intellij.plugin.powershell.lang
 
 import com.intellij.lang.Language
 
-
-/**
- * Andrey 26/06/17.
- */
 class PowerShellLanguage : Language("PowerShell") {
 
   companion object {
     @JvmStatic
     val INSTANCE = PowerShellLanguage()
-  }
 
+    /**
+     * Language id for PowerShell LSP.
+     */
+    const val LSP_ID = "powershell"
+  }
 }

src/main/kotlin/com/intellij/plugin/powershell/lang/lsp/ide/EditorEventManager.kt

@@ -70,7 +70,7 @@ class EditorEventManager(
       if (isOpen) {
         logger.warn("Editor $editor was already open")
       } else {
-        requestManager.didOpen(DidOpenTextDocumentParams(TextDocumentItem(identifier.uri, PowerShellLanguage.INSTANCE.id, incVersion(), editor.document.text)))
+        requestManager.didOpen(DidOpenTextDocumentParams(TextDocumentItem(identifier.uri, PowerShellLanguage.LSP_ID, incVersion(), editor.document.text)))
         isOpen = true
       }
     }