Adds Coveralls GH Action

.simplecov

@@ -1,4 +1,18 @@
+
+if ENV['GITHUB_ACTION']
+  require 'simplecov-lcov'
+
+  SimpleCov::Formatter::LcovFormatter.config do |c|
+    c.single_report_path = 'coverage/lcov.info'
+    c.report_with_single_file = true
+  end
+
+  SimpleCov.formatter = SimpleCov::Formatter::LcovFormatter
+end
+
 SimpleCov.start do
+  enable_coverage :branch # Only supported for Ruby >= 2.5
+
   add_filter '/spec/'
   add_filter 'helper'
 end