fix(install): fix install method

.vim_runtime/sources_non_forked/rust.vim/ftdetect/rust.vim

@@ -0,0 +1,15 @@
+" vint: -ProhibitAutocmdWithNoGroup
+
+autocmd BufRead,BufNewFile *.rs call s:set_rust_filetype()
+
+if has('patch-8.0.613')
+    autocmd BufRead,BufNewFile Cargo.toml setf FALLBACK cfg
+endif
+
+function! s:set_rust_filetype() abort
+    if &filetype !=# 'rust'
+        set filetype=rust
+    endif
+endfunction
+
+" vim: set et sw=4 sts=4 ts=8: