renderer: don't render plaintext files as RST

rhodecode/lib/markup_renderer.py

@@ -88,7 +88,7 b' class MarkupRenderer(object):'
         elif MarkupRenderer.RST_PAT.findall(filename):
             detected_renderer = 'rst'
         elif MarkupRenderer.PLAIN_PAT.findall(filename):
-            detected_renderer = 'rst'
+            detected_renderer = 'plain'
         else:
             detected_renderer = 'plain'
 

rhodecode/tests/lib/test_markup_renderer.py

@@ -33,13 +33,13 b' from rhodecode.lib.markup_renderer impor'
         ('readme.Rst', 'rst'),
         ('readme.rest', 'rst'),
         ('readme.rest', 'rst'),
-        ('readme', 'rst'),
-        ('README', 'rst'),
 
         ('markdown.xml', 'plain'),
         ('rest.xml', 'plain'),
         ('readme.xml', 'plain'),
 
+        ('readme', 'plain'),
+        ('README', 'plain'),
         ('readme.mdx', 'plain'),
         ('readme.rstx', 'plain'),
         ('readmex', 'plain'),