[LSP] rust - Add support for rust-analyzer via LspInstall. (#178)

init.lua

@@ -51,6 +51,7 @@ require('lsp.bash-ls')
 require('lsp.go-ls')
 require('lsp.js-ts-ls')
 require('lsp.python-ls')
+require('lsp.rust-ls')
 require('lsp.json-ls')
 require('lsp.yaml-ls')
 require('lsp.vim-ls')

lua/lsp/rust-ls.lua

@@ -0,0 +1,5 @@
+require'lspconfig'.rust_analyzer.setup{
+    cmd = {DATA_PATH .. "/lspinstall/rust/rust-analyzer"},
+    on_attach = require'lsp'.common_on_attach
+}
+