Add tsx provider, closes #330

after/ftplugin/tsx.vim

@@ -0,0 +1,21 @@
+if exists('g:polyglot_disabled') && index(g:polyglot_disabled, 'tsx') != -1
+  finish
+endif
+
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+" Vim ftplugin file
+"
+" Language: TSX (JavaScript)
+" Maintainer: Ian Ker-Seymer <i.kerseymer@gmail.com>
+" Depends: leafgarland/typescript-vim
+"
+"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+" modified from html.vim
+if exists("loaded_matchit")
+  let b:match_ignorecase = 0
+  let b:match_words = '(:),\[:\],{:},<:>,' .
+        \ '<\@<=\([^/][^ \t>]*\)[^>]*\%(>\|$\):<\@<=/\1>'
+endif
+
+setlocal suffixesadd+=.tsx