Change info message for markdown readme in repo

[bernt-matthias]

not sure if we should check for correct markdown.

[nsoranzo]

@mvdbeek To answer your question from Matrix, a README.rst is rendered on the TS 1.0 (see e.g. https://toolshed.g2.bx.psu.edu/repository?repository_id=552adf1ac7cd330f&changeset_revision=18c0086450bb ), while a README.md is not (see e.g. https://toolshed.g2.bx.psu.edu/repository?repository_id=9be0eab5a3639fee&changeset_revision=74810db257cc ).
I cannot check on the TTS (i.e. TS 2.0) since any repository details page loads forever for me today.

So maybe we should keep this check for now?

[mvdbeek]

What I mean is, this isn't displayed at all in the install process in Galaxy, so you wouldn't ordinarily find it.

[mvdbeek]

(and having a markdown readme is anyway a bit irrelevant as a check, you should be free to have one whether or not you also have a RST file)

[nsoranzo]

I think a tool developer may find the "No README found skipping." surprising if they have included a README.md and don't know about TS not supporting it. I'll propose a different wording at info level.

[nsoranzo]

What about:

diff --git a/planemo/shed_lint.py b/planemo/shed_lint.py
index 38f4ffd4..322d1675 100644
--- a/planemo/shed_lint.py
+++ b/planemo/shed_lint.py
@@ -159,16 +159,15 @@ def lint_readme(realized_repository, lint_ctx):
         if os.path.exists(readme):
             readme_found = readme
 
-    readme_md = os.path.join(path, "README.md")
-    if not readme_found and os.path.exists(readme_md):
-        lint_ctx.warn("Tool Shed doesn't render markdown, " "README.md is invalid readme.")
-        return
-
     if not readme_found:
         # TODO: filter on TYPE and make this a warning if
         # unrestricted repository - need to update iuc standards
         # first though.
-        lint_ctx.info("No README found skipping.")
+        readme_md = os.path.join(path, "README.md")
+        if os.path.exists(readme_md):
+            lint_ctx.info("Found README in Markdown format, which is not rendered by the Tool Shed, skipping")
+        else:
+            lint_ctx.info("No README found, skipping.")
         return
 
     if readme_found.endswith(".rst"):