Update date parser to fix another time zone issue

The Washington Post has its feeds with EST, which is getting parsed by miniflux as UTC, and showing up as 8 hours off.

See http://feeds.washingtonpost.com/rss/politics for an example.

This fix applies a similar workaround for EST/EDT as was done for PST/PDT.

reader/date/parser.go

@@ -340,5 +340,9 @@ func parseLocalTimeDates(layout, ds string) (t time.Time, err error) {
 		loc, _ = time.LoadLocation("America/Los_Angeles")
 	}
 
+	if strings.HasSuffix(ds, "EST") || strings.HasSuffix(ds, "EDT") {
+		loc, _ = time.LoadLocation("America/New_York")
+	}
+
 	return time.ParseInLocation(layout, ds, loc)
 }