Add tip about browser caching. (#1113)

More than once, I've spent time tweaking settings, when all I really needed to do was a hard refresh after an upgrade to force the JavaScript to reload. Mentioning this in the documentation.
jazzband · Nov 7, 2018 · ff190ff · ff190ff
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commit ff190ff
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diff --git a/docs/tips.rst b/docs/tips.rst
@@ -14,6 +14,10 @@ requests and return responses. Putting the debug toolbar middleware *after*
 the Flatpage middleware, for example, means the toolbar will not show up on
 flatpages.
 
+Browsers have become more aggressive with caching static assets, such as
+JavaScript and CSS files. Check your browser's development console, and if
+you see errors, try a hard browser refresh or clearing your cache.
+
 Middleware isn't working correctly
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