Use first line of detail string in completion menu

Fixes remaining issue in #16

Some servers send multiline detail strings in completion suggestions.
Split to just the first line to avoid ugly characters and long menu.

CHANGELOG.md

@@ -1,4 +1,4 @@
-# 0.2.2-dev
+# 0.2.2
 
 - Completion Improvements:
   - Bug fix: Don't leave an extra character when completing after typing 3
@@ -9,6 +9,7 @@
     list.
   - Use the `triggerCharacters` suggested by the server instead of `.`
     exclusively.
+  - Use only the first line of suggestion detail in completion menu
 - Bug Fix: Send and allow a space before header content.
 
 # 0.2.1

autoload/lsc/complete.vim

@@ -236,7 +236,7 @@ function! s:CompletionItem(completion_item) abort
     let item.kind = s:CompletionItemKind(a:completion_item.kind)
   endif
   if has_key(a:completion_item, 'detail') && a:completion_item.detail != v:null
-    let item.menu = a:completion_item.detail
+    let item.menu = split(a:completion_item.detail, "\n")[0]
   endif
   if has_key(a:completion_item, 'documentation')
       \ && a:completion_item.documentation != v:null