disable semantic highlight by default (#656)

Author: prabirshrestha

doc/vim-lsp.txt

@@ -576,10 +576,10 @@ g:lsp_log_file                                           *g:lsp_log_file*
 
 g:lsp_semantic_enabled                             *g:lsp_semantic_enabled*
     Type: |Boolean|
-    Default: `1`
+    Default: `0`
 
     Determines whether or not semantic highlighting is enabled globally. Set
-    to `0` to disable sending requests.
+    to `1` to enable sending requests.
 
 g:lsp_text_document_did_save_delay   *g:lsp_text_document_did_save_delay*
     Type: |Number|

plugin/lsp.vim

@@ -39,7 +39,7 @@ let g:lsp_signature_help_enabled = get(g:, 'lsp_signature_help_enabled', 1)
 let g:lsp_fold_enabled = get(g:, 'lsp_fold_enabled', 1)
 let g:lsp_hover_conceal = get(g:, 'lsp_hover_conceal', 1)
 let g:lsp_ignorecase = get(g:, 'lsp_ignorecase', &ignorecase)
-let g:lsp_semantic_enabled = get(g:, 'lsp_semantic_enabled', 1)
+let g:lsp_semantic_enabled = get(g:, 'lsp_semantic_enabled', 0)
 let g:lsp_text_document_did_save_delay = get(g:, 'lsp_text_document_did_save_delay', -1)
 let g:lsp_completion_resolve_timeout = get(g:, 'lsp_completion_resolve_timeout', 200)