Removed workaround for missing main.html in themes.

Related to #1168.

docs/about/release-notes.md

@@ -25,7 +25,16 @@ The current and past members of the MkDocs team.
 
 ### Major Additions to Version 1.0.0
 
-#### Previously deprecated Template variables removed. (#874 & #1168)
+#### Previously deprecated Template variables removed. (#1168)
+
+##### Page Template
+
+The primary entry point for page templates has been changed from `base.html` to
+`main.html`. This allows `base.html` to continue to exist while allowing users
+to override `main.html` and extend `base.html`. For version 0.16, `base.html`
+continued to work if no `main.html` template existed, but it raised a
+deprecation warning. In version 1.0, a build will fail if no `main.html`
+template exists. 
 
 ##### Page Context
 

mkdocs/commands/build.py

@@ -153,16 +153,7 @@ def _build_page(page, config, site_navigation, env, dirty=False):
     if 'template' in meta:
         template = env.get_template(meta['template'][0])
     else:
-        try:
-            template = env.get_template('main.html')
-        except jinja2.TemplateNotFound:
-            # TODO: Remove this in version 1.0
-            template = env.get_template('base.html')
-            log.warn(
-                "Your theme does not appear to contain a 'main.html' template. "
-                "The 'base.html' template was used instead, which is deprecated. "
-                "Update your theme so that the primary entry point is 'main.html'."
-            )
+        template = env.get_template('main.html')
 
     # Render the template.
     output_content = template.render(context)