add .tool-versions file

bryanjos · bryanjos · commit abca9e267cad · 2017-05-11T05:47:41.000-05:00
diff --git a/.tool-versions b/.tool-versions
@@ -0,0 +1,3 @@
+elixir 1.4.2
+erlang 19.3
+nodejs 7.10.0
