[julia] Remove warning about LanguageServer.jl not working in 1.0

Remove warning indicating that LanguageServer.jl is not working in
Julia version 1.0, because it was updated and that problem was fixed.

CHANGELOG.develop

@@ -2289,6 +2289,8 @@ Other:
   - Fixed =julia-mode-local-vars-hook= (thanks to Guido Kraemer)
   - Limited =evil-surround-pairs-alist= redefinitions to julia mode
     (thanks to duianto)
+  - Remove warning about LanguageServer.jl not working in 1.0
+    (thanks to Daniel Molina)
 **** Keyboard layout
 - Added support for Colemak layout (thanks to Daniel Mijares, Lyall Cooper and
   Eivind Fonn)

layers/+lang/julia/README.org

@@ -46,9 +46,6 @@ for installation, and then install this layer with:
      (julia :variables julia-mode-enable-lsp t)))
 #+END_SRC
 
-Warning: [[https://github.com/JuliaEditorSupport/LanguageServer.jl][LanguageServer.jl]] has not yet been released for Julia 1.0. If you are
-using this layer with Julia 1.0, =julia-mode-enable-lsp= should be set to =nil=.
-
 =LanguageServer.jl= tends to have a very long startup time. In the worst case,
 =lsp-mode= might give up on the language server before its started, but
 regardless usage of =lsp-mode= with Julia can cause long delays when first