Adding tabnine for compe (#640)

lua/plugins.lua

@@ -425,4 +425,12 @@ return require("packer").startup(function(use)
 
     -- Elixir
     use {"elixir-editors/vim-elixir", ft = {"elixir", "eelixir", "euphoria3"}}
+
+    -- Tabnine
+    use {
+        "tzachar/compe-tabnine",
+        run="./install.sh",
+        requires = "hrsh7th/nvim-compe",
+        disable = not O.plugin.tabnine.active
+    }
 end)