Merge pull request #858 from erlang-ls/update-makefile

Update Makefile to build needed .plt for typer tests

Author: robertoaloi

Makefile

@@ -8,7 +8,10 @@ install: all
 	@ echo "Installing escript..."
 	@ cp _build/default/bin/erlang_ls /usr/local/bin
 
-ci:
+$HOME/.dialyzer_plt:
+	dialyzer --build_plt --apps erts kernel stdlib
+
+ci: $HOME/.dialyzer_plt
 	rebar3 do compile, ct, proper --cover --constraint_tries 100, dialyzer, xref, cover, edoc
 
 coveralls: