Revert "update to JDT language server 1.2.0-202106301459 (#337)" (#344)

This reverts commit 28c56ec.

Author: yyoncho

lsp-java.el

@@ -47,7 +47,7 @@ The slash is expected at the end."
   :risky t
   :type 'directory)
 
-(defcustom lsp-java-jdt-download-url "https://download.eclipse.org/jdtls/milestones/1.2.0/jdt-language-server-1.2.0-202106301459.tar.gz"
+(defcustom lsp-java-jdt-download-url "https://download.eclipse.org/jdtls/milestones/1.0.0/jdt-language-server-1.0.0-202104151857.tar.gz"
   "JDT JS download url.
 Use http://download.eclipse.org/che/che-ls-jdt/snapshots/che-jdt-language-server-latest.tar.gz if you want to use Eclipse Che JDT LS."
   :group 'lsp-java