Readme template fix (#42)

Author: goruha

README.md.gotmpl

@@ -1,5 +1,5 @@
 {{- defineDatasource "config" .Env.README_YAML -}}
-{{- defineDatasource "includes" (env.Getenv "README_INCLUDES") -}}
+{{- defineDatasource "includes" (env.Getenv "README_INCLUDES" | default "./") -}}
 {{- $deprecated := has (ds "config") "deprecated" }}
 {{- $utm_link := printf "%%s?utm_source=%s&utm_medium=%s&utm_campaign=%s&utm_content=%s" "github" "readme" (ds "config").github_repo "%s" -}}
 {{- $homepage := printf $utm_link "https://cpco.io/homepage" "" -}}