handleTextChanged in TextChangedP

This commit and the previous one fix ncm2/ncm2#58 and ncm2/ncm2#59

Author: roxma

plugin/LanguageClient.vim

@@ -109,6 +109,9 @@ augroup languageClient
     autocmd BufDelete * call LanguageClient#handleBufDelete()
     autocmd TextChanged * call LanguageClient#handleTextChanged()
     autocmd TextChangedI * call LanguageClient#handleTextChanged()
+    if exists('##TextChangedP')
+        autocmd TextChangedP * call LanguageClient#handleTextChanged()
+    endif
     autocmd CursorMoved * call LanguageClient#handleCursorMoved()
     autocmd VimLeavePre * call LanguageClient#handleVimLeavePre()