switching to github repo for rebar3_codecov plugin

to test that plugin repo is correct, run:
   rm -rf ./_build/default/plugins/
   ./rebar3 codecov analyze --lcov

rebar.config

@@ -185,7 +185,7 @@
  [
   {pc, "1.14.0"},
   {provider_asn1, "0.3.0"},
-  {rebar3_codecov, {git, "file:///Users/denysgonchar/git/rebar3_codecov", {branch, "exclude_modules-option"}}},
+  {rebar3_codecov, {git, "https://github.com/esl/rebar3_codecov.git", {branch, "master"}}},
   {rebar3_lint, "2.0.1"}
  ]}.