Merge pull request #726 from cmu-delphi/bot/update-covidcast

update to COVIDcast Classic v2.6.4

Author: krivard

package-lock.json

@@ -8,7 +8,7 @@
     "katex": "^0.16.3",
     "uikit": "^3.15.11",
     "www-covidcast": "https://github.com/cmu-delphi/www-covidcast/releases/download/v3.2.3/www-covidcast-3.2.3.tgz",
-    "www-covidcast-classic": "https://github.com/cmu-delphi/www-covidcast-classic/releases/download/v2.6.3/www-covidcast-classic-2.6.3.tgz",
+    "www-covidcast-classic": "https://github.com/cmu-delphi/www-covidcast-classic/releases/download/v2.6.4/www-covidcast-classic-2.6.4.tgz",
     "www-epivis": "https://github.com/cmu-delphi/www-epivis/releases/download/v2.0.3/www-epivis-2.0.3.tgz"
   },
   "devDependencies": {